How do you quickly prepare tomatoes for pizza?
If I want to top a pizza with tomatoes, I generally only add them in the last two minutes of baking. The texture retains some character and they get warm to hot in that amount of time. Basically I just take the pizza out a minute or two before I expect the pizza to be fully cooked, top the pizza with sliced or chopped tomatoes, and stick it back in briefly.

Alternatively, if you don't mind the tomatoes being lukewarm or colder, you can slice them and add them just after baking is complete and serve. If I have particularly good quality tomatoes, I'll typically skip cooking them.