Personally, I don’t think about hatches all that much. I find not thinking about hatches simplifies my life.
There are a lot of styles of fly fishing, and a lot of approaches that work. Most people eventually find a way of fishing that works for them and go with that. If you are interested in hatches because you find hatches interesting, that’s great! But you don’t actually need to worry about hatches all that much unless you want to.
Using myself as an example. Unless I find myself unexpectedly surrounded by big numbers of a particular insect (and perhaps more importantly trout that are keyed in on one insect to the exclusion of other insects) then I just do what I normally do, which is nymph. I carry a few dries for emergencies, but unless I see a LOT of fish rising I don’t usually tie one on.
The same with streamers. I know they work great, and catch better than average sized fish, but to me streamers are too similar to gear, and if I wanted to use gear to catch trout I would just use gear.
So everyone is different. But to be clear, there are some epic hatches in Oregon, and if you want to target them then you have plenty to look forward to.
Just don’t ask me where they are lol