If I look at my local airport (Palo Alto), there are certainly a few 152s and even 162s, but the great majority of trainers are 172s, with the odd PA28. I think that's pretty typical.
Though if you REALLY want to fly a 152 there's always this (well, I wanted to post a photo, but I couldn't get it to work). But someone at Reid Hillview in San Jose has converted a 152 into a gyrocopter. Well, somewhat, I don't think it's finished and I heartily hope it never will be/