I'm not sure if you guys are really unobservant or what's going on there...
Other commentators have mentioned, and shown, in videos where things have happened after dynamic events. Where someone WILL congratulate you, and then in a devastated area, once you've cleared up, towns will start rebuilding and repopulating, and things will happen.
I'm not sure if you were just impatient and all "GOTTA RUN OFF TO DO THE NEXT THING!" barely waiting a second before anything happened. But there are other videos out there which show a very different story regarding dynamic events.
Not to mention that some of the kills and things that happen in dynamic events will be reflected in your city quarter, in the form of trophies and so on. You didn't mention this, either. So... again, I just found the video kind of misleading. I'm just given to wonder whether you guys were just really unobservant when playing, and not very thorough.
And there are plenty of hidden events, too. Some events are even hidden behind a parkour-laden gauntlet that you have to run before the event is activated. Some are just tucked away in really hard to find spots. TotalBiscuit's 'jumping puzzle' video is a good example of this. So, again, I think the 'oh, run up a hill and a monster is there' example is very misleading.
I think that your disappointment stems from your own impatience. But that's just the opinion of an informed person who's been watching lots of other videos and not just this one. I think you're too mired in troped MMO style gameplay to actually just want to go and wander around and explore, taking your time. Or to want to wait in an area to see what happens.
You guys strike me as power gamers. So the MOMENT the event ends you just rush off madly to do something else. Admittedly you're maximising what you do in the game, but you're also missing out on a lot of what happens if you weren't doing that.
Guild Wars 2, as a game, is aimed strongly at casual people. So... when you were madly rushing from the event you'd just completed, a shopkeeper might have turned up at a repopulated town, selling rewards complete to that area. Something that you would have missed.
They do say that things don't happen IMMEDIATELY but over time, and sometimes a little patience pays off. The way you speak in the video, you're expecting an immediate re-population of people, and immediate praise, but they're trying to work in a little believability into the process, and it doesn't work like that.
Another thing that's missed out on here is how dynamic events can lead to people turning up at your city quarter. For example: If you save a person's town, they may come up to you and tell you how thankful they are, and then offer to be a shopkeeper near where you live (in your city).
So you then get access to new, unique goods in your city.
There's a lot going on there, but I feel you're going to miss most of it if you're just madly rushing around, you know? "Oh, I've waited 20 seconds. I'm bored. LET'S GO TO THE NEXT EVENT! Nothing is happening here."
Anyway, just critique of the video. And I'm hopeful that unlike other sites (thanks to certain bloody egomaniacs) that you won't be thin-skinned enough to ban me for it.
I just feel that it's fair to offer a counterpoint, because I didn't really think that your video was a fair portrayal.