Apart from the above posts explaining about those of us who have watched from Day 1 and our addiction to it

, in reply to your 'is there nothing else to watch' question - on my TV - NO.
We are on a a relay transmitter so, including several +1 channels we get around 15 channels (which does include 2 children's channels) - so make that about 8/9 channels. Tonight for some strange reason Film 4 is off air until around 11:30pm, 3xBBC channels are showing the Olympics which I don't watch and, unless I fancy a bit of benefit/poverty bashing - which I most definitely do not - or another reality TV show (MIC), then my options are pretty much zero.
Oh, there's Benidorm - no thanks, and a show about a sheepdog. There's a 999 type show, but having just spent my holiday in Holland mostly in a hospital, I don't particularly fancy that!
So that covers that one - if I were to sit here and say to myself, let's watch something else to entertain me on TV at 9pm tonight... my choices are very very limited!
That being said, I continue to watch BB because I always have and I still choose to do so.