The only reason why I am not using tor right now is because of it's barrier of entry. I can probably figure it out, but currently the effort outweighs the return.
Aside from all that, if you don't significantly modify your browsing habits, all you've now done is increase your interestingness to the NSA et al. and made your browser run slower and use more RAM.
So, there is a bit more involved than running an executable.
https://www.torproject.org/projects/torbrowser.html.en
I'm probably still missing a few layers of security if I want to order a pound of purple kush or a hitman or something though (right?)
As far as it being slow to load sites, there will always be a high latency when using Tor. It’s the nature of onion routing. If Tor becomes more popular, I’m hoping there will be a way to donate to high bandwidth exit nodes to keep the network performance up.