Now-generation consoles

You don't see it on the 3DS because Nintendo ruined the 2 screen dynamic with the 3D. You have to have your eyes on the top screen all the time. The screens being different sizes doesn't really help ether. That's the one thing I hate about the 3DS a lot of the more interesting and odd games that you used to get on the DS just don't happen anymore.

I agree I wouldn't want to see it forced into games either. I would rather it came naturally like the DS did so you end up with unique and interesting games that only the Wii U can deliver. The problem is like you said no one is doing that. So Nintendo don't really have choice. They will have to push hard and make use of the second screen to try and get others to.

I wouldn't really say that the 3DS completely ruined the concept of the second screen with the 3D, but then I can't remember the last game that made extremely good use of the second screen either. The only exception is RPGs, which have more expanded stats on the bottom screen, but in reality that's not all that necessary and RPGs have been doing fine without that for years.

It depends on the type of game. Nintendo has been adding secondary "features" to their systems for a while now. Some games fully utilize them and make them a core aspect of the game. Other games simply do not need the secondary features. For games that come out on multiple systems, it is often not worth the extra costs to add the functionality in.

Look at two early dames of the DS, Kirby CanvasCurse and New Super Mario bros. Kirby was made around the touchscreen and would be unplayable without it. Mario did not even need the touchscreen at all. It depends on the type of game.

Some games do make good use of the "extras" Nintendo puts in their systems, but they're few and far between. Far more often there are games that don't need the feature, whatever it is, being forced into the game for no reason. My earlier example, Super Mario 3D World, uses the gamepad simply because it's there, not because it's wise for gameplay, and above that giving the player the choice of controller only to revoke it later for some gimmick is the worst. "Hey, you have a Wii U Pro Controller? You can use that to play....EXCEPT RIGHT HERE! Oh and here! And over there! Were you using it? Go back to the Gamepad jerk, what's wrong with you?"

I always felt Metroid Prime 3, regardless of the game itself, was crippled by the forced usage of the Wiimote stuff. I found the controls more cumbersome than they needed to be and often found myself getting stuck in areas because the Nunchuck or Wiimote just didn't feel like responding to some motion-based action in time for a time-based event. It's why I never looked into getting the Trilogy, because Prime 3 was far less fun than it should have been to me because of the controls. The basic Wiimote screen stuff was fine, but when they started pushing all the controller motions to activate actions is when I stopped having as much fun as I should have.

Overall I think Nintendo's ideas are often pushed to prove that the idea wasn't unnecessary, and it ends up screwing up potentially enjoyable games. If they start pushing the gyroscope crap into Wii U games to make the Gamepad seem like it was the best idea they've ever had, then I believe that they'll end up having bigger problems than they already do.

Above that, if the Wii U has been out for a year and they only just now decided that they're going to find ways to use the Gamepad in their games, then they really shouldn't have released the Wii U when they did. What's the point of having this special pad with its own screen and such if they don't know how to use it themselves? How do they expect other developers to use it when they can't even think of good uses for it, or what it's capable of? The best usage of the Gamepad was with Nintendo Land, and after that it was over, it's like they just expected everything to work out with no effort because Nintendo Land existed.