Since a user-friendly nozzle doesn't seem to exist on generic gas cans, I found alternative replacements. Better buy them while you can!
http://www.ezpourspout.com/

I like how their "water can" spouts are available for sale where the gas can spout is prohibited.

Another option is what I purchased:http://www.amazon.com/gp/product/B000MTCQO2/ref=oh_details_o00_s00_i00

Actually saw these mentioned in a post on the Politics board..

I've given up on those damn nozzles. Now, I drilled a small hole in the top of the funnel and ran a string from the funnel to the gas can handle. Every time I pour gas, I just take the nozzle off and use a funnel. Amazing that we can fly somebody to the moon, but can't buy a gas can with a decent nozzle.