I do sometimes, and I voted accordingly. Not sure what how the plug-in you're suggesting changes things but, frankly, I prefer to see the sites I visit in their usual PC-centric configuration. Wikipedia, Yahoo! and some others have alternate mobile configs and I don't like them very much compared to what I'm used to seeing. Safari on the iPod is slow but works okay for me - and its resize features make it pretty easy to navigate even non-mobile-optimized sites. Far worse is whatever PoS browser lives on my Crackberry. Barely useable that.
M