Western Washington might be like Wales. I was very comfortable in the UK. But eastern Washington, Idaho, and a lot of Oregon, have very different climates than western Washington.
Second, unless it was an extremely long road trip, I doubt you saw much. That would be like me saying I experienced the UK because I zigzagged around England and Scotland. You’re talking about a space that’s 4 or more times the area of England.
Point is this. 1, yeah, you can be more than a few days from a major road. It’s big, and there is a lot of undeveloped land. That’s hard for someone in a place as relatively small as the Uk to fully realize. And 2, because of the size and geography, it’s really impossible to generalize the climate. Seattle and Olympia are cities in Western Washington, both in a narrow strip of land that is at sea level, next to salt water, sandwiched between two mountain ranges.