Yeah, I did, actually.
The last time I had lunch with Chuck P., in part of the discussion, writers and their process came up, and I brought up PKD and he brought up F. Scott Fitzgerald.
We were discussing them and how they were relating to some things we were working on.
I didn't get the impression that Chuck was influenced by PKD. I brought up some of PKD's spiritual epiphanies that went into some of his later works. PKD's description of the colored light that he saw, etc.
Chuck mentioned that it sounded like some symptoms that accompanied siezures or a stroke, and I mentioned that others have theorized that as well.
In either case, it was a very real physical experience to PKD and influenced much of his later work (i.e. The Exegesis).