If you are a new camper, that likes to be around a lot of people, any of the Valley campgrounds are great. For me, it is way too busy. I want to get out of the city, and with the amount of people I felt claustrophobic.
With that said, Yosemite is one of the most majestic places on the planet, and I don't care where you camp, just go! Each site has a bear box, please be sure to use it, you will encounter numerous wildlife while you are here, and they all want your food! They also come with fire pits and picnic tables.
I didnt spend alot of time at my campground due to the fact that the valley has numerous hiking trails, so many waterfalls, lectures nightly on different environmental topics.
Be sure to reserve your site well in advance. Spring is best time to go, but seriously, just go!