Let’s not BS. I speed spam all of the surveys and questionnaires (the optional ones too), but (on mobile at least) it does take around 5 minutes.
I just use a desktop for all of it. I can click through the news articles and do the rewards homepage things in under a minute. Speed of M&K I guess. An android VM will let you quickly grab those mobile points.
There are always a few things where I have genuine interest in something and read an article from a link, I don't include that time.
As far as GP quests go, I enjoy trying different games and that's just part of my gaming time. A lot of times that's how these types of reward programs work, I'm a gamer and if I can spend a minute or two of my gaming time to complete these I get the rewards. And those rewards are just from this, so, I will spend those rewards on gaming related things without ever giving it a second thought. I've bought a couple games that normally I would have waited for a better sale or cdkeys or something or that I was on the fence about, but it was just rewards points. If you are figuring it like a job, these types of programs aren't for you. Plus, you get the points for some of the new releases, if you are going to buy those anyway, might as well get the discount.
If you look at it as a perk for doing a few specific things with your gaming time, these things can be rewarding and fun. Hopefully that's the way it goes for the Sony program as well.