I'm sure it's a fine shortcut, but it's hard to reverse years of habit. Feel the same?
It's easy to switch back. Go to:
System Settings > Keyboard > Launchers.
Select Launch Terminal.
Press Backspace to clear Alt+Ctl+T,
Then press Alt+F2.
Supposedly, you can skip the step of clearing the old shortcut and just hold down the new one for a moment to replace it. Didn't work for me.