I don't pretend for a moment that the cons we have here in Scotland are in any way as big as the ones you mention - San Diego, etc._ but we do have them. Traditionally, they were organised by aka, the comic shop and a couple of them were bigish affairs over a weekend with big name guests and no-one, as far as I remember (and I was one of the organisers), charged for signatures and most guests were happy to chat away to fans/collectors. Nowadays, one of the regular, nationally organised cons is more media, games, dressing up, dvd's than comics and has tables with guests, all charging for autographs and pictures, and comic dealers tables are few and far between. I'm afraid that doesn't float my boat.
There is a newish con on the block in Glasgow and the last couple of years it has been growing and there are some decent comic creators and a lot of small press folk showing up.
As with crash, I really want to find piles of comics I can look through to find something that I need or that sparks my interest. I don't collect autographs or figures. It was so much more fun years ago when you could wander into a local pub or restaurant with/or find already there, a comics creator or editor who was perfectly happy to have a chat and a drink.
Not having attended an American con I can't comment on them but I have been at the Angouleme con in France more than once and it was a great experience. Now, I might have been in a better position to meet industry people being, at the time, involved with the comics industry and D.C. and being on personal terms with a number of artists and writers but it seemed much more relaxed, less formal and less big business and all about money back then. And I hope and assume it was not that difficult for the average fan to meet their heroes. I know fine well that money was an important factor, it just wasn't as obviously the main item on the agenda.
Another old fogey's opinion with the past viewed through rose tinted specs.
Actually, I'll be meeting some friends at a small con in Edinburgh tomorrow. Guests include Gary Erskine, Alan Grant and Norm Breyfogle plus a lot of small press folk. Hopefully a good sprinkling of comic dealers. Looking forward to it.