Please, stop fooling yourself. DLR also has construction that is just as visible as MK's hub, and also takes a long time building it. For the initial World of Color construction, the entire edge of Paradise Bay was open to bystanders, with the exception of the viewing area itself which was being redesigned. It wasn't a matter of putting your camera over a wall or peering through a mesh screen, it was just plain exposed to everybody walking by
The drained bay lasted for about a year while they built the show. Testing and continued construction (also visible to everybody) lasted about 5 months after that. Plus, when the show first opened they had problems getting the platforms to raise and lower, so they were locked into their visible positions for the first several months that the show was performed, essentially giving guests about 2 years of obstructed views
And please don't pretend like the upcoming multi-month closure of the show is any sort of accelerated schedule. When they debuted the brand-new Winter Dreams show last year (and the highly modified version this year, as well as multiple alterations to the original show since it opened), they did it while running the regular show nightly. In fact, the show has only missed a couple nights since it debuted in June 2010, running multiple shows most nights. If they were really pushing for something special, they could easily program the new show while keeping the existing one going; they've done it before.
And if you want construction projects that take absurdly long after being absurdly delayed, look no further than the recent safety enhancements to DLR's Alice in Wonderland, which took nearly 4 years to get approved, after installing the 'temporary' solution
Yes, DLR does do some things better, like holiday overlays. And WDW also does some things better, like one-off weekend-long special events (runDisney, Star Wars Weekends, etc). Neither one is free of faults, and it gets old to constantly read comments about how perfect DLR is, when it struggles with things just like WDW. When it comes to construction, both are about the same, and (for the most part) about as good as can be expected within the confines of a theme park that operates for 18 hours a day