I think I may be the one zebra referred to with 3 kids under 4 and the subversive granny .
I guess I would say we are light consumers of kids tv. We videoed Come Outside, and also have some Rosie and Jim (which I personally find annoying but the kids love). Most week days they maybe have 1/2 an hour before tea - keeps them quiet while we get food ready. They are happy to keep rewatching the same things - they don't get bored - I do . They would watch for hours if left to their own devices. Often at the weekends they don't watch it at all, and less in summer and more in winter.
They are unaware that there a regular times on tv when kids programs are shown, although the older one does recognise Tractor Tom, and many other characters that we have rarely seen on tv - not sure where he has picked it up from .
I personally hate cartoons - I hate the short attention span and the unreality of it all (and the American accents ). My boys would be happy to watch them but are just as fascinated watching wildlife programs, or even Time Team . So we skip the cartoons.
We (DH and I) watch quite a lot of TV (much of it videod and watched at a later date) in the evenings - too brain dead by then to do much else (although in summer we tend to be outside more). I think there is a load of rubbish on, but you can find some good stuff.