It's the first thing I noticed changed, and the first thing I tried (and failed) to re-enable. I am part of the "don't like change" crowd, but normally just get used to it can carry on. This is the first functional change which actually made me a little angry!
EDIT: Found this to restore just the addon bar: https://addons.mozilla.org/en-US/firefox/addon/the-addon-bar...
Nerdrage subsiding