My personal opinion is that Tv is a blessing and a course.
I tried to keep my PFB away for TV for almost a year, then when she was nearing a year she did watch a bit of night garden.
The good thing about not having TV on a lot ( I never had it on for myself in the day either) was that she never asked for it.
However, when DC2 was born, I had to use the TV sometimes to give her something to do while I was upstairs trying to get the baby to nap.
I tried to keep DC2 away from it as much as I could but DD1 started to ask for more TV the more TV she was introduced to.
Now DC2 is older they both like to watch together. I do try to limit it though as I don't like being asked to put it on all the time. The less they watch the more of a treat it is when I put it on at a time convenient to me (when preparing tea for example).
I do find that if they watch a lot, they get very lethargic and grumpy afterwards so it's definately not a good idea putting it on before DD1 goes to school but it's better when she's tired and grumpy anyway.
The difficulty with limiting TV is that as soon as my DC go to my relatives the TV often gets put on and I find it more difficult to limit it. It seems rude to ask GPs to switch it off but I do try to set up an activity or game if they've watched a bit too much.
Over Christmas they watched loads in other people's houses and were then asking me for it constantly for a while which I hated. They stopped playing with their toys and I honestly wondered why I'd bothered buying them.
The other thing that annoys me is that if DP is looking after them, he tends to just switch the TV on for an easy life.
Sorry for waffling but I think my point is I don't think TV in moderation is bad but be careful as you might end up with TV addicts who whinge and moan for cbeebies the moment they get out of bed.