whenever and however you learn you do it with the best resources at hand, and the net just happens to offer an easily accessible and cheap resource.
Does it make us lazy? well If you count the hours spent looking for and using learning aids found on the net I don't think so.
Does it stop us from developing ear and listening skills quicker than if we had to work it all out for ourselves? YES definitely
Does it stop us from becoming better guitarists? hmmmmm, perhaps with out the easy access to the wealth of info and support from sites like this on the net, I might have given up long ago but instead I have persevered and just want to keep on learning which includes developing ear skills, so NO way, I am getting better everday
Cheers
Peter