I agree with Justfish's assessment of the crowding situation on the Tully. Naturally, the anglers go where the fish are located, and they are located in the limited areas of good habitat. Thus, the crowding.
That having been said, and without specifically referencing jfetkin's experience for which he probably had a perfectly good reason to be ticked, I also think that SOME anglers are a bit (perhaps a lot) overly sensitive to the presence of another angler, even when another angler is fishing the oppostite bank. This is certainly situational, but in general on a stream that is as wide as the Tully, and located in a high population density area, anglers who are nymphing or using short casts and concentrating on fishing for extended periods of time on one side of the stream should expect others to move along and, yes, carefully fish the opposite bank or side of the stream. On other streams I have for years seen bait anglers and spin fishermen fish opposite banks and cast, in effect, to the boots of anglers across the stream without even an exchange of a glare, and yes, with both still catching fish. Yes, we would all like to have a stream to ourselves, but don't expect that in an urban special reg area unless you fish weekdays in the rain or arrive at first light. Some fly anglers need to lighten up or stop fishing crowded streams.