So, yes, it is in fact true you're not going to use most of those buttons, or you'll use them only every once in a while. However, like Hasrat mentioned, there's no reason for you to sit on your GP. You should be constantly using it and letting it regenerate.

Think about your goals in gathering. If you want more items, then you want to use skills like Blessed Harvest and Bountiful Harvest. (In fact, if you have enough GP, these can stack, further increasing your yield).

If you want HQ items, then Leaf Turn is what you want to use. And if you have a low chance to collect something in the first place, then Field Mastery is your go-to.

A lot of the buttons you have are also for the Collectibles system. If you want to know rotations, I've been following this blog post forever, and it still works for Shadowbringers: https://na.finalfantasyxiv.com/lodes.../blog/2596906/

Also, stock up on Cordials, which are GP potions. You can buy NQ versions with GC seals, HQ can be crafted by alchemists, and you can buy Hi-Cordials with scrips.