No, but not out of lack of interest in the nominated and winning titles.
When I look at the nominees, I find that I already have a very good idea of which products interest me and which ones don't. Out of this year's winners, for example, there are only three products I don't already own that I intend to buy: Grimm (FFG), Lost City of Barakus (TL/Necromancer) and Crime & Punishment (Atlas).
Grimm is the exception: prior to the ENnies, I was interested in it, but hadn't planned on buying it. The awards it got motivated me to give it a closer look, and doing so made me decide I'll buy it at some point. Lost City and C&P have been on my buy list for awhile, and the ENnies didn't change that.
Heck, there are still a few things on my buy list that won ENnies in 2003 -- but none that I wasn't already planning on buying before the awards.
I don't think the ENnies are useless by any means -- I've voted both years, attended in 2003, and taken an active interest when the process starts -- but given the amount of time I spend thinking about what gaming goodies to buy, they don't have a whole lot of influence on me.
(This turned out longer than I expected -- I hope it's useful to someone!)