A tip I got on a previous HN thread was to set HKCU:\Software\Policies\Microsoft\Windows\Explorer\DisableSearchBoxSuggestions to 1 so that when you type something into the start menu search box it actually returns installed applications and files on your hard disk instead of internet search results. That's been a huge productivity boost for me, and reverts the behavior to what it used to be a couple years ago.

Also from this thread I have now added HKCU:\Software\Microsoft\Windows\CurrentVersion\Dsh\IsPrelaunchEnabled to 0 to stop Widgets.exe from executing on startup. Unfortunately it still starts up if you accidentally swipe the touchscreen from the left.