The best investment you can make in your own productivity (speed++, frustration--) is to learn the shortcuts for your most common actions. Edits, tools, grouping, display order, fill-in-the-blank. Commit to it and make it a habit, you'll never look back.
The polygon editing buttons are great. They're also not optional. I'd like to see the edit buttons removed.
They complicate training by offering a visual shortcut to the wrong way of doing something, right next to something users need to use and see all the time: the polygon editing. They remember the little button because they've
seen
it, and they forget Cmd+D because they've only
heard
that. And then people coming from Windows are used to looking on the context menu for everything, which is an even worse way to Drag and Mirror 200 times a day. </rant>
Seriously, if you're doing something all the time, learn the shortcut.