To me there are a couple of approaches, in heavy metal music having multiple guitar players playing basically the same thing really thickens it up, without hearing the differences between guitars til one solos.
Now take a song like Sweet Home Alabama and you can pick out all the different guitars, i think it takes a lot of respect between players to do this, in my case I aint got no respect for other guitarist so it wouldnt work.
Of course we just a weekend warrior cover band so why would I want to split the money anymore than I have too, for me being the only guitar is a challenge that I just love.
When I record I like to double my rythym guitar with a LP and a Strat, they just kind fill in the holes for the other.
But my hat is off to people that can make this work.
It would be cool to do harmony leads with another guitar player, but hell I just use my whammy pedal for that, sounds tight everytime! LOL!
"A winks as good as nod to a blind man"