It's good for you. All research into cognitive functions and neurology say that the more you actively engage your mind the longer you remain in full control of your mental faculties in later life.
And what exactly is different about the way Win7 looks compared to XP? Three buttons in the title bar, that is the same configuration used since Win95 14 years ago: Check. Close window button still red: Check. Icons on the buttons the same as they have been since Win95: Check.
The Start menu is a bit different from Win95-2000, but if you give it a chance, it's actually fairly useful over the old one. But it's nearly identical in Win7 as it was in XP by default. The only real difference is if an app supports the new task bar menu system, the name of which eludes me at the moment. It's a purely optional sort of thing, and you only see it if you hover the mouse over such an app.
The taskbar has been made to resemble the Dock which first made its appearance in NeXTStep, and then Mac OS X after Apple bought NeXT and used it as the foundation for their new OS. I honestly think it's far more logical in its current incarnation compared to how it was in Win95-Vista. It's a more natural way of grouping all program windows together. It could use with some tweaking, but it's a good first effort.
I'm not overly fond of their changes to the control panel, but a big part of life is change, and adapting to that change, so that's what I intend to do.
So, aside from some minor cosmetic changes, I'm left scratching my head as to what exactly is so different about Win7 that a person of at least average intelligence couldn't figure it out and adapt with ease. There haven't been any radical and fundamental changes to the way Windows operates since Windows95, and even that is pushing the definitions of those words. A lot of things that have been in Windows since at least 3.1, are still there in Win7, operating in pretty much exactly the same way, they might just look a little different. But not so much that a person of at least average intelligence shouldn't be able to quickly adapt to said changes.