Actually since I got tivo, I watch more TV shows, but it takes me much less tmie to do so.
You dont realise how much time commercials take up until you reduce them to 1 minute total per show.
It's great!
ALso, be sure to check out the JAVAHMO
http://javahmo.sourceforge.net/
It lets you stream shoutcast streams and whatnot to the tivo, pretty cool.