I do that a couple times a day. Almost everything that I do with these devices stays in sync through various accounts/cloud in the background. Admittedly I'm just doing this at home, but when I travel, I pretty much always bring my iPad (in addition to the iPhone and my Apple Watch which are on me as long as I'm dressed and awake). I don't have it set this way at the moment, but you can even have any app that you install automatically get added to the other device.

It's very different than a typical laptop/desktop situation since those are harder to sync (depending on what OS/apps/files/etc are involved). However if a lot of what you do is in the cloud, then maybe switching between laptop and desktop is more fluid.