Why do people dislike Schrader valves?

I don't care about Schrader vs. Presta- neither seems better or worse- if anything the Presta valves are more of a pain in the ass because you have to close them up after you're finished pumping, heck- they probably weigh more. I've read that people don't like the "larger hole" required for Schrader- but then are perfectly fine putting in Presta adapters... Is it that the "professionals" use Presta? or that boom bikes came with Schrader?

I just don't like having to switch my pump head over on my Leszyne pump.