Actually, my parents hate widescreen, so I can maybe help to articulate some of the arguments against it. First of all, while you're getting more of the picture, it has to be made SMALLER to get the whole image on the screen. Widescreen HDTVs are not the norm yet, so we have to deal with a shrunken image. And it's hard for some to make that sacrifice when very little important information is usually lost. The scene in Treasure Planet, ironically, is a perfect example. Both of the characters talking are still in the screen; the stuff in the background is, well, just background. And while it's useful for movies to have their original dimensions when shown on TV, my parents feel that widescreen on TV shows themselves is just a way of jumping on the latest stylistic bandwagon.
Mind you, I don't completely agree with these views. I'm the kind of person who wants to see EVERYTHING. I just wanted to help make clear that people who are against it aren't necessarily crazy or stupid.
Personally, if a TV show is shot in widescreen now, it should simply be planning for the future. I don't mind if they make it widescreen only for those who have widescreen TVs. Then, when widescreen TV is common, we'll all get the full image. If they had wanted to keep Farscape Season 4 in the fullscreen dimensions for most viewers, then provide WS format for those with WS television sets, and offer it in WS on the DVD, I wouldn't have minded a bit.
BTW, a good case for the need for widescreen can be found in "The Sound of Music," especially during the "So-Do-Me-La" number. Robert Wise (the director) used the full canvas of the screen to glorious effect here. Interestingly, NBC hit on a compromise when broadcasting this movie in recent years: they'd show the numbers/scenes that really needed WS in that format, then go to commercial and come back in fullscreen.
Anyway, this argument will all become moot in about 10 years or so when we all have widescreen TVs. Then we can complain about those annoying black bars on the sides of our screens for old TV shows.