To help in adding tools quickly it would be useful to have some form of quick keys or maybe somewhat a combination (enhancement) of search bar / right-click.
So here's the pic and a 1,000 words

And here's the blurb
The idea being that hitting a key whilst mouse is over the canvas would display the search bar at the mouse cursor position. Once you've selected the tool you want it hitting return[+shift] adds it to the canvas either:
- In a dragged (mouse down) state to help for final position and automated connections and then a final left-click to add to canvas or,
- Just add it at that position.
This would also speed up adding tools as you could include things like 'Recent' or 'Favorites'. I grant you that you could just incorporate this into the search dialog but save you a bit of eye movement. Don't get me wrong the search bar is great but it's the lots of drag-drop that can slow things down a bit.