Model work of 1987 compared to CGI work of 2011?
The problem with that line of thought is that you're choosing to selectively ignore the reality of the situation.
You have to actually compare 1987 high-budget model work benefitting from recompositing and cleanups with modern post-production technology and 2011 low-budget CGI by a studio with a bad track record at it (let's face it, the space CGI shots were by far the weakest part of TOS-R).
Yes, 2011 CGI might well be awesome if done on a comparable budget to the model work done in 1987, but those monetary resources are not available. With the available resources, combining the 1987 model work with modern compositing is going to produce the best possible results.
Heck, just look at the CGI Galaxy done for the Enterprise finale to prove the point that the refurbished model shots can outdo low-budget CGI (which it was by S4).
It's not being old-fashioned, it's being pragmatic rather than wishing for things that just aren't in reach. (Though personally I'm also rather happy they're reusing the original photography simply because I'd like them to preserve as much of the original footage as they can.)
Basically the only good thing about them trying to go CGI would have been that they're going to need the CGI production pipeline for a DS9 remastering due to all the CGI stuff done for DS9 they can't scan negatives of. But in the end I'd rather not have them train on TNG ...