Yeah, they sprayers are actually more work in many ways. You have a lot of time masking as nestor said. You have LOTS of time cleaning. You cant just paint for an hour here and an hour there. Cleanup itself could take an hour. Additionally, for the spray job to look right you still need to roll over it.
I get asked quite often my opinions on gimmick things. One such thing is the paint stick. Its a roller than can store paint in the handle and feed it into the roller. This works pretty well in that it saves you from going back and forth to the paint tray. The cleanup is longer than just cleaning a roller so only use it if you are going to be doing a large area. Also, when using it, I have someone else do cut ins if possible. You want to be able to roll over the cut in wet edge for a professional result.
If you can find someone who can cut in the ceiling without needing to mask it off then you can save time there too. Its a technique that can be learned but is hard to describe in a post.
Lastly - if you are going to mask things off check out frog tape. I haven't tried it yet but I definitely will on my next project. Frog Tape Painterís Tape with PaintBlock Technology
Watch the video on that page. Looks neat and cures my frustration with the regular painters tape if it works.