I've gotten used to seeing other anglers; that doesn't bother me as much as it used to. So, to me, solitude is more like not feeling like you're waiting in line to find a place to fish or feeling like you're fishing in someone else's footsteps because there's nowhere to fish where you aren't.
When I was there in the Spring years ago, I think we saw a small group on the way out, but that was it.
We typically fish out of a few select frontcountry sites and can get out of other anglers' way with little to no effort.
thanks for your input/insight!