I like to think it doesn't bother me when a bike is in my favourite space when I arrive but if I'm honest it does a bit. Guess it must be a territorial thing.
Worse than any of that though, much worse, some numpty on one of them tiny bikes with the really low saddles that you tend to see teenagers and drug dealers on, has today locked their bike to the back of the adjacent row of bikes, (all 6 bike racks face north, with about a 3 foot gap between the back wheels of locked bikes and the front of the next row) but this idiot has parked his bike facing south, somehow locked to the row behind so completely the wrong way round & blocking the whole row) so now you can't pass by without moving the bike out of the way - how dumb is that?! Sigh....mutter.....grumble......