I've only made a few bed sized quilts and although I'd like to have one for my bed, I don't see it happening.
Years ago I realized that I didn't have the patience to piece and quilt something that big. The fact is that I get bored easily so I make a lot of small wall quilts, bags, and pillows. They make great gifts, I get to enjoy designing and quilting them, and they don't use up lots of fabric, so they're less expensive.
I've also discovered that by working smaller I get more work done, and I can try out new techniques. I can also toss it if it isn't working and move onto something else. I'd feel too guilty giving up on a big quilt, but forcing myself to finish something I'm not enjoying doing would make me too unhappy. So, I keep my projects small enough to keep me interested long enough to finish them!