I have rediscovered some shortcuts I found a few months ago. I had forgot what they were until now. Here are 3 undocumented tools on the ID editor I found through chance. They seem to be little known and inaccessible without these shortcuts; I have not seen them mentioned elsewhere on OGF, or on the wider internet.
Bring up a small map of your surrounding area on the top left of the screen. It can be used to jump large distances by dragging the map. This can be activated by pressing the forwards slash (/) key.
Does what it says on the tin. Press the W key.
Select an object and a tab appears in the bottom right of the screen. This gives the object's ID, and its length if it is a line, and the object's perimeter and area if it is an area. Press Ctrl+I.
I hope this makes ID a bit more bearable for its users.
EDIT: All 3 functions are listed on the 'shortcuts' page of the OSM wiki. They are quite easy to miss and are not separated from the standard functions, however.