I remember feeling pretty much the same way when I finished that. Nothing else by PKD came close, although to be honest I gave up after just three others, only one of which (The Man in the High Castle)) is to my knowledge well-respected. As for me, I just finished Prelude to Foundation. I have mixed feelings. The dialogue was stilted, but the pace was good and the ending, of course, was pretty fantastic. Certainly I enjoyed it, but I'll be curious to see how later books in the series compare. Before reading any of those, though, I've simply got to read Caliban's War.