I think I've played nearly as much Wii as Wii U this year. (I prefer to use my original Wii rather the Wii U's backwards compatibility as I don't want to wear out the disc drive on the latter)

Just this month I've replayed Dead Space Extraction and Donkey Kong Country Returns, and I'm currently playing through Epic Mickey.

Do you guys still revisit Nintendo's last gen system, or at least its games?

Not recently. Everytime I think about it, I remember I have to use the Wiimote, and I decide against it.

I honestly think I've used my Wii U to play more Wii games than Wii U ones. Currently, I'm replaying Twilight Princess on Wii U.

That I do, right now replaying Metroid Prime Trilogy.

tbh I also revisit games from NES-NGC(right now playing Tales of Symphonia) and GB-DS so yeah I play a lot of Nintendo

Don't have a WiiU, so I can't really say. I think I'd play Wii games more often than not with it, though, because I have some backlog to work on. As for this...

Go and play Umbrella and Darkside Chronicles!

I recently managed to complete Super Mario Galaxy on my Wii U, so, yes. Yes, I do.

I replayed Darkside Chronicles last month, but I don't actually own Umbrella Chronicles. If I see it at a good price, I'll pick it up. :)

(Man, even at 40+ games I'm still looking to expand my Wii library. That system has way more quality games than the internet gives it credit for if you ask me)

Definitely, I've got closer to 60, when you add in other games ported to other systems that I own it had quite a reasonable library. 

For me, it's more about just jumping around in general. I played Wii a bit for Skyward Sword and Fatal Frame 4, as well as Tales of Symphonia, as I am part of the let's play of it. I've been playing on on PS3 for Akiba's Trip, Super Nintendo and Super Famicom for the X games and other random Japanese games, and on my 3DS. I sorta just go with what I am feeling at the time. I often get an itch to play, regardless of what console it is on. : D

I'm just finished playing Super Mario Galaxy 2 and I may play one of the prime games for like the 10 time before XCX comes