My two are 3, and 15 months. They watch TV extremely rarely. Kind of by default and maybe fortunately, but our TV subscribtion doesn't get any channels that have children's TV except at odd times like 3pm when I forget/one is napping so we don't catch it all for that reason.
But when the eldest was younger and we lived in the UK and had kids TV on tap, I avoided it except for selected stuff that I liked, like Tinga Tales and Baby Jake, as I disliked how slack jawed the little one was when watching it - that, and the inanity of it - In the Night Garden was so so so so repetetive! I used TV when the baby was feeding as it usefully distracted the eldest from wailing/leaping about on me and the baby/preventing the baby from feeding. However I prefer using short bursts of DVDs (Fireman Sam, Pingu, Peppa Pig is about all we have, and music DVDs called Love to Sing). I can't stand the massive meltdown that ensues when I turn the DVDs off though so I use them sparingly eg when I need to cook dinner and the children just can't seem to play without screeching.
I'd like to think I will keep TV/screen time to a minimum as they get older too, but who knows. My sister and I gawped for hours after school and in holidays at absolute crap from when we were about 10, but as younger children we never had a TV. Instead we read books, played board games, ran around and generally found other amusements which I consider to be a much better thing. Personally I think there is no need for young children to watch much and as I mentioned above, when the children do watch they are the picture of slack jawed cliched TV watching and practically drooling, so I dont like it for that reason.
TV has it's place - rainy days when other options exhausted, distraction at dinner cooking time, but it is all to easy imo to rely more and more on it so I prefer just to not really use it.