As far as I'm concerned, everyone should! The world's scientific community is being retrained and held back by a chronic lack of computational power, and BOINC is a platform for the public to solve that problem. If you have a computer, of any kind, you can help.
If you would like to learn more about the projects that are currently looking for volunteers, here is an exhaustive list.
I think I have a spare laptop with a decent gpu that I could start BOINCing with.
A decent GPU opens up a lot of additional projects that just CPUs won't do much for. You could, for example:
and a whole bunch more!
Sounds pretty sweet, I'll try it out after work tomorrow. Thanks for the info!