I know I'm coming in WAY after the fact here, but I have something useful to add to this discussion so I hope I'm not doing something wrong.
I've created accurate CGI replicas of the GENS bridge and the Voyager bridge, as well as the 1701-A/B bridge from Star Trek VI and VII, respectively. (See most of them here:
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The movie I linked to was framed in 2.35:1, and from the experience I can tell you a couple of things. The TOS movie bridge sets and the Voyager bridge all work in a 2.35 image because there's enough detail to actually fill the entire frame even if you go wide with your camera; the sets were all clearly constructed with a wide aspect ratio in mind, and shots just frame themselves naturally. You can point a camera at pretty much any part of those sets and wind up with a lively image that fills the frame. With the vanilla TNG design, even once you address the issues with shot framing, you still wind up with a set that's hard to shoot in for a movie, because only a couple of angles offer detail throughout the frame.
Forgetting arguments about the lighting for a minute, the GENS bridge works better for the same reason--there's enough visual detail to fill a frame and give a director a good amount of freedom in how they frame shots. Looking at the various shots that actually appear in the movie, it's easy for me to see why they made the modifications. Think about the times when the sides of the set were visible, like both of the panning wide shots we get--first when everybody comes in from the holodeck, and then again when the Armagosa star collapses. The presence of the auxiliary stations added some much-needed detail to the frame. The same goes for when Picard is pacing and he asks Data how soon the ribbon will arrive--in all of those cases, there would've been just a dull blank wall in the background; having the side stations there adds some much-needed life and detail to the proceedings. We can debate the in-universe logic (and you'll get no argument from me that the ramps are too narrow with the side stations), but the redress they did for Generations gives you a set that's a lot more interesting from a visual standpoint than its TV counterpart. When I was working with my virtual replicas, I had a very easy time framing shots with every one of them, except the TNG bridge--until I rebuilt it to resemble the GENS design.
I've also heard the argument that the additional crewmembers working around the bridge made it too cluttered and that it went against the "technology unchained" vision that Gene supposedly had in 1987. I actually thought the additional workstations made it more realistic, not less--think about it, over the course of TNG's run, we saw a wide variety of departments and functions across the ship, and I never really bought into the idea that (for instance) ALL of the functions of the various science divisions could be handled through those two small stations...or that ALL of the engineering functions (of a ship that Picard's log entry in the pilot described awe-inspiring in its size and complexity) could be handled from a single terminal. When we remember that the Enterprise's primary function was exploration, it makes sense that they'd have the ability to do a lot more at once on the bridge.
Naturally this is just my two cents (or maybe four).