Really rarely right now, but i do like it a lot.
It helped me when playing through some games and the fanart from some people are just amazing!

Usually to check out people's amazing art skills.

So a lot.

mostly never. I used it a bit at first but, there is next to no point of it anymore. It is not a real social thing. If i do go on it, it is to go to the art academy to look at the art that people draw. Other than that, don't use it. If they improved it where you could actually have discussions much better and were not so anal on the censoring (I got a warning last month because I said "I found this puzzle retarded") and stop with the horrible post restrictions, then I may use it more.

I used to spend a shit-ton of time on Miiverse in 2013, but nowadays I spend just a few minutes daily!

Not much honestly, though I did spend some time in the Golden Sun community. Answered a few questions and such.

It's a nice way to see peoples first reactions compared to LP's.

Over 86 hours from Christmas 2012 according to my Wii U. More than any game.

I would spend more if they didnt delete the interesting communities.

This E3 in particular had a great community and they could have kept it for discussing later Nintendo directs and for people to basically hang out and talk about Nintendo games. But, despite all outrcries for it to stay open they closed it.
I havent visited anymore since.

I'm really shocked by the amount of people referring to Miiverse as "useless" or "pointless". I find Miiverse incredibly useful. It's an easy way to find help through a particular part of a game. The artwork posted is amazing, and you can see how much creativity is fostered on the Wii U, which makes me wonder about the people who don't appreciate that creativity in/being shared by others. I find using the Gamepad for interaction a million times better than scrolling across a virtual keyboard with a directional pad to click one letter at a time, but maybe that's just me. Personally, I hated typing people messages on the XBox 360 (I barely used the headset that came with the system, to me it was about as annoying as talking to people through a walkie-talkie). I've always argued that posting your own highlights in Miiverse voids any need for achievement list where Microsoft/Sony gives you a virtual "pat on the back" for clearly the first stage of a game or killing 100 enemies, but I guess some people need that more than others. My Miiverse profile contains all the achievements I think are worth sharing, so I don't need EA telling me that I haven't gotten 100% enjoyment out of my game because I haven't yet scored 100 points 50 rebounds and 50 assists in a single game with Lebron James yet. Maybe I'm in the minority, but I think Miiverse is one of Wii U's best features.

If you don't use the PC site. Miiverse takes too long to load up. If I need help in a game. It's far faster to just load up gamefaqs.com. Nintendo deleting E3 and the like doesn't help. A perminate place for that type of chatting is needed. I don't really care about the artwork on Miiverse.

That's how much time I spend weekly on Miiverse!