Unfortunately that carrot is starting to look good to me

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In layman terms, what all would DX11 bring to the table?
The no DX10 on XP was not some scheme by MS - that is ridiculous. It was and is impractical to re-architect XP to do all that was brought to the table with DX10. MS said so, and the DX10 on XP stuff from the ALKY group, later Falling Leaf, and now the junk pawned off by some Russian hacks are all from the same original guys. Big plans for MAC / LINUX / Windows game support, later changed to be a project just for DX10 on XP, later changed to "we bit off more than we could chew, Microsoft was right, we give up, sorry if you sent us money...bye", leaving the Russian (Georgian) crap scraps of ALKY pawned off as their own. Junk.
In any case, bottom line, there really is nothing DX10/DX11 offers visually that can't be rendered using DX9. The issue is it can be vastly simpler and more efficient for the developer to do in DX10/11, and they are unlikely to spend the time to build a separate render path for DX9 that 'looks' the same. Not to mention, the performance hit to make a DX9 render path do all the things that can be easily / efficiently done in DX10/11 ranges from somewhat heavy to utterly unusable. There are a few things that really are impractical with DX9, but it starts to get technical, and you asked for simple...
So, if you want the real eye candy, more and more you will require DX10/11 capable hardware and OS environment.