I was there to. I know I'm probably not going to be popular for this, but I think I prefered this to the last race I went to, the 2008 British GP. It was more fan friendly (as far as I know the drivers don't sit in the pitlane on sunday signing autographs at GP's)
They do do signing sessions, but I think they are on Fridays.
You can't expect F1 to be as open simply because the drivers would get so swamped with fans. That being said, I think anyone would agree F1 certainly could improve fan access but you have to keep in mind its always going to be somewhat limited as drivers (and team principals, etc) are usually busy as it is without being slowed down by fans wanting dozens of autographs. Its always going to seem better at low-key events just because the drivers don't generally have the same popularity and the attendance figures are far lower.
All the events I have ever been to allow open access to the paddock and at least an early morning pit walk. But I can easily understand why higher profile events look to limit who gets access. Just being at the BTCC events gives you a small insight into the sheer amount of people that can gather around drivers. (Chilton had people chasing him around the paddock!

).
Personally, I'm not entirely a believer in forced autograph sessions and so on. Some drivers may not actually enjoy the adulation, which is perfectly natural, not everyone enjoys or even understands the limelight. I've heard instances of drivers like Trulli sometimes ignoring autograph requests - but I don't think this is necessarily just because the drivers are ignorant or not appreciative of the fans support, it may just be because they aren't public people who like to talk to any old stranger. I think society puts too much emphasis on one type of character trait which not everyone has because I've seen so many people take it personally that Trulli or whoever has ignored them.
The other side is that as some world's top sportsmen, they have a duty to at least meet the fans and build up the support this way. For some people, it helps them feel more part of the sport, which although a bit odd, is still something that needs to be considered from a business perspective.
I don't really "get" autographs or even the excitement of some people upon seeing or meeting famous people. Its nice to recognise and have a chat with people who have achieved but beyond that I don't see why people get so caught up in fame.