This was the first time I stayed in Curry Village, and it was in Janurary of 2008. Yosemite is great year round, but if you plan to visit the Valley, I'd suggest you go in winter. I was there for 3 days, and I did not see ONE RV. You could actually get around fairly easily in a car, and park in any avaiable location. If you have an inclination for photography, the opportunities in Winter are endless, and far superior to Summer. Spring is also nice, but the crowds pick up toward the end of Spring. But I digress...
We stayed in a "heated" tent cabin, and we had that poor heater working triple overtime our whole stay. You open the door, and you lose much of the precious heat generated by the small, overworked heater. However, it did the job satisfactorily for basically a canvas tent. I'd say the overnight temps were in the upper 50s in the room, when it was around 25-30 degrees outside. You'll be fine if you bring the proper gear, and use a sleeping bag on the bed. Speaking of which, the bed was quite uncomfortable to me, but I'm very sensitive to bad beds. I'm sure if you are used to camping, this would feel like heaven. To me, it was better than sleeping on the ground, but still uncomfortable.
The tent cabins are very tightly spaced, and I could see in Summer this place being a zoo. I saw a sign in the shower room that said they have 36 showers for 507 guests. I'd probably HATE being there with that many guests. Speaking of the showers, they are actually in pretty good order. The water was quite warm, and the facilities looked very clean. Again, keep in mind it is winter, and there were probably, at most, 15 cars parked in the lot each morning. So, that really helped with the cleanliness and overall experience.
In summary, I'd highly recommend this place in winter. You'll have the place virtually to yourself. The rates are about half in winter too, which makes it better to stomach than the ridiculous price in summer. We really enjoyed this visit, having Yosemite all to ourselves. Summer in Yosemite Valley is too crowded to enjoy. Tuolumne Meadows is where to go for summer visits.