Why does everyone complain about Glock’s “grip angle”?

When I pick up a pistol I line up the sights and pull the trigger. I don’t understand how some people could pick up a pistol and find it impossible to use for something as silly as a different grip angle. I have Glocks, Springfields, RIAs, and more companies’ pistols and not once have I noticed anything dramatically different enough about the way they feel in my hand to affect how I shoot with them.