There is no light pole trick for WOC. That was for Fantasmic.
First, the 90 minute early rule is only for the first show of the evening. Being 90 minutes early may be "too much" on some nights. The important question for you is if it will be too much on YOUR night. And you will not know until your night comes. If you wait until 60 minutes to arrive "just to see" and it is not enough then really, truly, you will not be able to see the show. And it will be too late. And you will wish you arrived earlier. Pretty much 90 minutes early is enough "every night" so you do not have to wonder. My experience having seen WOC 12-15 times
for the first (or only) show is I have never regretted showing up 90 minutes early for any of the shows. The few times I have come later have always resulted in an imperfect view. But since I am 6 ft tall I can manage better than children and shorter adults.
Bottom line - if you are going to the first show get there 90 minutes early if you want to
for sure get a good view of the show.