From the OU website:
“Rav Belsky, zt”l said that it is unclear whether pizza is a snack or meal food, but noted that the general custom is to say Mezonos when eating a small amount.
It should be noted that if the pizza dough is fully baked prior to adding the cheese (as is the case with some frozen Pizzas) the bracha would be Hamotzi. When the dough is baked alone, its status at that time is Hamotzi, and that does not change when a filling is added.”
It seems, that one is allowed to make a Hamotzi if they wanted to, especially if they were to eat the pizza as a meal.
Personally, I try to wash and make an Hamotzi, its not a big deal and gives us an opportunity to Bentch and thank Hashem for all the good that he bestowed upon us.