On the 737ng I usually put my hand on the TL after engagement of the AP. Since most airplanes has an automatic increase/reduction of thrust to set CLB thr I find it good to stay in the loop by lightly feeling what it does. And to able to chop it incase I need to level off immediately due to traffic.
Sometimes the takeoff reference is set incorrectly and therefore thrust levers does not move when so should. I don't worry at all about unintentionally whacking it to idle after departure and working against the A/T servos trying to maintain the N1
