I am a very frequent visitor to the Sierra Nevada, and I have run the gamut of backpacking, camping, hotel suites, etc throughout the Sierra. I have also traveled throughout Southeast Asia, Europe (including over a dozen trips to the Swiss Alps), and I can say, without a doubt, that this is one of my favorite natural places. As a caveat, I live somewhat nearby, but it is really something special. If you are a newbie to the Sierra, I'd say fighting for space in Yosemite Valley should be a priority, but if you have the time or ability to make repeat visits, this is absolutely a highlight. Try to visit in Spring when the snow is still on the peaks and the rivers are flowing hard. If you are a backpacker, it is such an amazing playground that one could spend a lifetime exploring. If not, at least drive down to Road's End along with seeing the "big trees" in Sequoia.
I cannot comment on the facilities here because I really don't use them much, instead using the designation of the area as a national park and wilderness as a basis for many adventures. If Yosemite, even in the backcountry, leaves you wanting for solitude, this is your place! I suspect, like most national parks in the west, that they are minimal and mediocre at best (for food, lodging, etc). However, if you are the least bit adventurous and interested in the grandest of natural places, this is a place you cannot miss.