Personally I prefer the feel of the thicker paper - just feels like a higher quality product to me.  Its not a big enough deal though that, for example, I'd take a glued binding with the old paper over the new paper and sewn binding though.

I'd like to see in hardcover:
Avengers By Perez/Byrne (181-202)
Alpha Flight by John Byrne Omnibus
Excalibur by Claremont/Davis Omnibus Vol. 1

Shazam by Don Newton