the guy that has to wait until 10min before dark to get lucky on a rusty spinner to save your day.
Somebody say my name?
I don't know from Kelly Galloup. He makes some kick ass streamers. But I don't think he's saying "under no conditions should you ever try to make a really long ass cast." He's saying, "that's not the best way to catch fish."
On the other hand, ask Joe D what the most important skill on the Upper D is, and I'm pretty sure he'll say the ability to throw a very long and reasonably accurate reach cast. Maybe the other guides on here could weigh in on that.
The difference, like JC said, is the spookiness of the fish, but it's also how and where you're fishing. If you're up high in the bow of a drift boat on a sunny day, casting quartering downstream to a bank sipper that is a mile away in the shady margins of the river, a super common situation on the WB or Main stem, then you're better off throwing that hero cast then trying to row close. Put your oars in the water once, and you're stuck waiting another 10 minutes for the thing to come up again.
But in a different situation - a 50' or 60' cast upstream or directly across the current from a wading position - the long cast is generally useless because of all the drag you're going to get on your line and leader the moment it touches down.
Still, you see lots of yahoos like me and my cousin trying this on a daily basis on the WB and elsewhere, because the rods and lines allow us to cast that far. The worst habit I have is lining nearby, catchable targets in order to get to a probably uncatchable one that looks a little bigger further out, then getting pissed when I can't set the hook, and in the process putting down the whole pod of fish. sound familiar? I think Galloup's talking to those guys, not the experienced fisherman trying to catch a spooky fish that he knows will only be caught by a long, downstream cast.
anyway, I've definitely found that most of my hookups on any river come in a kind of middle ground where you're not too close to spook the fish and not so far as to require a crazy cast. Maybe 20' - 30'?