Is the Gray's route steep?

I have a bad right knee that only gives me pain on steep inclines and declines. I've hiked it a few times but I don't live in CO anymore but I want to come back for a little hiking trip before winter. I don't remember how steep the main route is. I think the switchbacks to the summit were more gradual than the ridge, and overall I don't remember it being overly steep. I'll have my poles with me too.

I'd love to do Sniktau and Grizzly again but that's way too steep and dangerous for me right now so I know my limits.