Spongebob is NOT welcome in my home, or some of the WEIRD shows on Disney or Nickelodeon. Really, PBS is on several hours a day, but I work from home and sometimes NEED to keep my son occupied. Yeah, I would love to do everything with him, but it's just not possible. I feel better being home with him and have him watch a few hours of quality TV, than shipping him off to some day care farm. I just don't trust others with my son, too much crazy in the world.
PBS has some fantastic shows, I highly recommend it. It's really the only reason I still have cable, all other shows are garbage.. More commercials than anything.
My step-son is 4, he's been living with us full-time for a little over a year. He has changed a lot over this time, but he still has many issues. I am afraid he is exactly the kind of child all the parents here try to avoid. He is very picky, and was raised in his high chair in front of the TV (when his dad was at work, which was A LOT). I actually saw him a few times when he lived with both his parents. At two years old he sat in his high chair for hours, eating stale Pringles from the can. He was sleeping at a different home every night (aunt, grandparents etc.) Mom playing with her cellphone nonstop. And then it's some sort of wonder that he has NO attention span, no discipline, bad attitude, extremely picky eater etc. Whatever toys he had (and still gets for Christmas from her side of the family) is battery operated. It's all sounds and flashing lights. When he plays he sounds like Tarzan, because he needs noise all the time.
Needless to say, we have books, blocks, balls, Duplo, a stick horse, jump rope, crafts materials etc. I have a few battery toys, like one of those music tables, a mini keyboard and this little house with switches and knobs that tells a story (it's morning, turn off the lights and take a bath. Then they have to switch off the light and turn the faucet, then it tells them to have some breakfast etc.)
I have reduced his TV watching a lot, but at his mom's place he has a TV in his room, on all day. It's just background noise to him that he can't do without. I find video games to be more educational than the shows he watches, so he can play an hour of Sonic a few times a week, rather than watch Disney channel (PBS ends at 6pm). It's a tough fight, he adores his mom, like any child would.. but the things they teach him *cringe* I speak no ill of his mom as a person, but I do address some of the issues we come across and teach him the correct way of handling things (She brings a dog to the pound every 3-4 months or so, because they tear the house up/aren't housebroken, just to get a new puppy. We taught him to find a proper home if you MUST rehome your dog, but really, you should think carefully before you get a pet.)
So I can totally understand the hesitation of allowing TV and video games in your home. I wish I was in a situation that I could throw the darn thing out the window *laugh* It broke in December, and I was tempted NOT to get a new one, so we got a used $5 CRT. Oh yes. It's a few inches smaller than the CRT that broke. Fiance still wants a flat screen.. uhm.. maybe some day...
It's a tough thing, to balance the modern (flawed) world, with healthy habits and solid old-fashioned upbringing. I really do think we're seeing an encouraging movement in raising kids though. I have faith in this generation

(honestly, texting and driving is the newest form of Darwinism).