It is a big difference east vs west coast of NA. West coast I consider 50’ a welcome shallow anchorage. 100’, give or take, is very common. Last boat had 400’ of chain, and this time around I got 600’. It’s rare that I put out less than 300’.
The big difference is that most of the East Coast boaters here are boating in the ICW or, even if cruising outside, still anchoring inside. The ICW is a dug ditch and only as deep as dug. In Alaska, we were very limited by only 300' of chain. Normally we dock rather than anchor but I recall the evening we left Glacier Bay. There were a couple of prime anchorages in relatively shallow waters and they were packed. Meanwhile there are an area of 50-100' depth that we had all to ourselves. Great anchorage, just too deep for the majority of boats there.
Coming down the coast, you don't go to a marina, you're often anchoring outside the inlet and only occasionally in "coves". You deal often with 50-100' depths and larger boats with more chain anchor considerably deeper. The coasts are very similar as long as you're outside and actually on the coasts and in the ocean itself, 1000 vs. 2000 or 2000 vs 5000' not really making a lot of difference.
I think of it this way. The highway is deep but the East Coast has an access road you can take the entire trip with rest stops sight seeing all along the way. The West Coast has no access road, only occasional exits along the way.
Another huge difference is the prevalence of large swells in the Pacific and often lesser wind waves while in the Atlantic the swells are generally much smaller but the wind waves worse.
As East Coast boaters, the west coast was foreign territory. Still, we very much enjoyed it. We were amazed at the comparatively lower levels of cruising from Cape Flattery to San Diego. We are use to the comments on Dock Queens on the east coast, but we spent three weeks at Marina Del Rey and were shocked at how little boat movement we saw although lots of dock activity.
I guess we felt a greater appreciation for the ICW's, Atlantic and Gulf, even if we prefer to cruise outside. They definitely lead to an increased level of boating activity, much as Puget Sound does in the PNW.