TL;DR, beyond the first page of the thread, but I'm liking the new look. Subtly different, but enough to make it feel more 'real', e.g. inside a starport, stuff in the distance a little more hazy. Makes me realise how 'cartoony' and primary-colours the old setup had been.
Depending on how the graphics changes have been done then I'd be supportive of FD allowing CMDRs to choose between old and new, but personally I'll be sticking with the new.
As an older player who needs glasses to read and use computers, I sometimes found the older 'high glare' graphic could be difficult to read some of the orange HUD text, e.g. is that a 5 or an 8 for distance to the next object. The new colours work much better at softening the contrast but leaving stuff legible.