On the Q400 "anticipatory" trimming was helpful during acceleration from V2+10 to cruise climb speed. Would have been quite some pitch force to push and then trim away.
Optimum technique varies between A/C using the stabilizer for trimming and A/C that just change the force required to move the elevator (by trim tabs like the F50 or by changing the "neutral force" position of the spring-loaded control column like the Q400).