Don't worry about the latest epithet-du-jour.
"Hoarder" is like "dysfunctional" is like "codependent"--just a bunch of words used by people who are unhappy in their lives who watch TV shows like Dr. Phil and the latest cr@p "reality" shows.
Live your life, enjoy your bikes and scr3w the labels. If your wife wants you to get rid of some bikes, and you want to stay with her, find out how many she's okay with, and do it because you want to keep her, not because you're worried about being labeled a "hoarder."