I certainly do not like to waste my money - as you said it is hard enough to earn - but neither do I want to waste the quality of my flying. So neither will I hurry through my own preparation nor will I allow myself to get nervous over another pilot taking her/his time to do things properly - whatever that may mean to her/him. Take-off carries risk and stress enough that I do not want to do it while recovering my breath from hurriedly pulling the plane out of the hangar, neither while recovering my calm after wishing all devils from hell on a fellow pilot.
I surely have occasionally taxied past a plane that left the apron before me, only to spend a long time in the field on whatever activity I saw no (more) need for, to take off first. Operating from a grass strip with no marked taxiways this is never impossible.
Looking back, I was taught to check as much as possible before even starting the taxi. Because if any check goes wrong it is "back to the apron" anyway. Without any document at hand I only recall the engine run-up just before take-off, and checking the turn-coordinator when turning in the taxi run. And a second verification of flaps and trims during the taxi.
Most of all, I was taught to take whatever time it takes. No more of course, but no less either. All praise to my instructors! And no, they were not professionally paid, not by a long way. At times I had to insist before they'ld accept any money at all.