I was a little worried this thread was not being represented by both sides of the issue, so I figured I would jump in. I come from the Protools experience and I never used Logic 9, so to me the colors and look of X are a welcome change after the misery of looking at the ugly Protools screen for so long.
I completely understand the needs of the mobile mixer. There was a time when I was using Protools on my laptop and would often find myself in difficult locations and varying lighting. However, today I do most of my work in my own studio, which I have maximized for comfort and workability. Occasionally, I work at other studios and am shocked at the bizarre anti-ergonomic setups people are willing to accept. The worst thing, in my opinion, is to have the monitor way up and away from the line of sight, usually on the top of a meter bridge and 4 or 5 feet away. I know one mixer who has his monitor way up on the meter bridge of a Neve VR console. To me, that's crazy. I can barely see anything on the monitor. i don't think he can, either. He is really good at using the Apple "zoom" function to scan around the timeline as if he is looking through a telescope. When I watch him work, inside my brain I am screaming, "Move the monitor closer!!!"
I adhere strictly to the idea that the monitor should be 18-28 inches away from my eyeballs and at a level height where the top of the monitor is even with my eyes. When flatscreen monitors first appeared, we used to put them on retractable arms that would allow them to float over the surface of the console. Eventually, I did away with my console, and now have my monitor at a nice 24" from my eyeballs, with plenty of space on the desk in front of me for keyboard and mouse. I never experience eye fatigue.
One of the things I really love about Logic X over Protools is the high level of customization options. It seems almost as if the Protools program is designed to be as NON-customizable as possible, while Logic offers a ton of customizable options. There can always be more, however, and it would be nice to have greater control over the colors. I can imagine a sort of "theme" based system where we could load different color palette presets depending on our working environment. If it were up to me, I would continue using the default theme we have now. I love it. I don't think the colors are drab or depressing. I find them to be warm and comfortable. But that's just me. And I think, unfortunately, that I am part of the older demographic you mentioned.