I know this is an perennial question, so I’ll ask it for this year’s release 
Is there an easy way to transfer Toolbars / Workspace, extensions and templates?
I regularly use 50+ extensions, several of them paid for, and the idea of tracking them all down is a bit daunting!
Sure I’d like shiny fresh installs but since most of them haven’t updated yet to 2021, I’m thinking it’s not going to be a terribly useful task in the short term…
(p.s. I’ve now transferred templates to SU2021 by copying files
from …AppData/Roaming/SketchUp/SketchUp 2020/SketchUp/Templates
to …AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Templates)