When I started reading this post it would make sense to use a local spreadsheet and avoid all the surfing, logging in and searching for the right tab. But when you use a cloud based solution, you still face the same problem as when using yet another (online) app.

For me personally a digital todo list must be as easily accessible as a notebook next to me. If you have your browser open, like me, with 10+ tabs, this is gonna be a problem.