I spent five hours sitting in various places waiting for things to happen, but it was worth it to be in the 8th row for the panels. My goal was simply to get in, so there was a bit of overkill involved, but I don't know that I'd have done anything differently with what I know now. (The room was ENORMOUS, but it did fill up entirely right before the Who panel was about to start.)
RTD and Burn Gorman did not make it. Wasn't really a surprise, since they were dropped from the last few BBC publicity releases. The explanation for RTD was that he was writing a Torchwood episode -- erm, they didn't know that two weeks ago when the schedule was announced? His absence certainly changed the tone of the Doctor Who panel (the questions were mostly variations on "Steven, can you tell us what will happen in S5?" "No."), but it was still fun. I think RTD might have provoked more interesting questions about the finale and such, though.
The Torchwood panel was pretty awesome, and I'm not even that huge a fan of the show.
I saw everything I wanted to see, and felt like I was pretty much done by 6pm or so. The exhibit hall wasn't heinously mobbed (except in a few places). Don't think I'd want to be there Saturday.
I have more to say, and pictures to process, and swag to sort through, but all of that will have to wait. I've been up since before 5am, on less than six hours of sleep. All worth it! More to come :).