I would agree that in general there seems to be more whinging in GA but it may be that it is just directed differently. Go to the States and they whinge about the Feds for all sorts of reasons, particularly now with increased security and closure of airspace just 'cos GW wants to go visit someone.
To add my 2 penneth, why do hundreds of US and Continental airfields survive with very small or in most cases in the States, no landing fees ? I have done quite a bit of GA flying over there and it amazes me to see these Mom & Pop airfields ticking over nicely, no landing fees, little diner, maintenance shop and a few aeroplanes tied down. Yet we go to some airfields in the UK, they snarl as you land, snatch a landing fee off you, won't discount it if you fuel or buy food and then snarl as you leave.
I think there is scope for a lot of airfields to look inwards, re evaluate what they provide and try be more customer service focussed - then trade increases, then they get busy.