I thought the whole point was that they weren't an awesome use of time. But then I never got an elementary school report card with a satisfactory grade on "uses time wisely."
Probably my only current productive hobby is keeping chickens. It is a good use of time because it really doesn't take a lot of time, but you get eggs. I also like to go for walks with my husband which is fun and good exercise.
My main time sinks are browsing this forum, playing World of Warcraft, and reading fiction (mostly fantasy). Everything else I just sort of dabble in when the fancy hits. I do a little vegetable gardening, sewing, halfhearted botany, camp once or twice a year and fish when I'm not too cheap to buy a license.