The 'wear' of gear changes is to clutch friction material as it slips to soften the torque as the next gear 'engages.'

Transmissions are designed with enough friction material to accommodate a certain number of shifts, depending on the transmitted torque during the shift.

Some have a shift selector that prevents torque converter lockup or 'overdrive' or delay shifts to higher gears for higher torque applications such as trailer towing or climbing steeper grades.

For the occasional journey to the hills, don't worry about it.