I usually press 1 and then 2 in rapid succession to do a double weapon switch, but then the tradeoff is I can't use WASD to move around at the same time as the double weapon switch. I could never use e though as a bind key since I use right and left lean all the time, especially with sniper.
I have binds for small movement that I use when I do elevators. I use k and l to move slightly left or right:
/bind k "; +moveleft; wait 2; -moveleft;"
/bind l "; +moveright; wait 2; -moveright;"
I also did similar binds for mousewheel up and down to move forwards and backwards slightly.
I currently use a bind to say "ty", I need to add more say things binds.
/bind u say "ty"
That's about it for things I currently have binded.