Lovely extensions list!
Be careful with import cost…it has a cost :) My buddy at work spent a while troubleshooting why his vscode had bogged down. The premise of this plugin is really great and important, but when you think about the work it has to do to glean those sizes for you, I'm not sure I want that in my editor. Of course, I came from using ST3 and vim when vscode finally felt like the one IDE that wasn't a hog. For me, bundlephobia on demand is how I will have to roll.
I would add indent-rainbow and webhint to this already great list!