Because (in my opinion) this is a tool aimed at the more proficient Excel user and even more so, the developer I deliberately tried to keep it all on one form so as to have all this functionality on names in one spot.
What would I like you all to do? Below there are three screenshots.
A. Current UI, icons on command buttons, buttons at the bottom of the screen
B. First Alternative: Icons on buttons, buttons at top, making it look like a toolbar.
C. Alternative 2: Buttons at top, text on buttons: no need to wait for the tooltips.
So which do you like best, A, B or C?