I have 2 guitar tracks and one of them has a cool reverb on it. Can I copy that effect and paste it into the FX bin of another track?
 
If so, how?
 
Thanks!

Yes.  You you can click and drag a plugin to another Fx Bin and also copy it with its current settings.
I believe Ctrl+Click-n-Drag will copy.
 
Btw, you should look at learning to use a Send for adding the same reverb to multiple tracks.  One way is to put the Reverb Fx in a bus and then Send each track to it, blending the amount to taste.  One benefit is fewer plugins hence less cpu power, another is better mix control.

you can also right click on that track in the track view and select "Create track template".
now each new project you open if you want that same reverb/guitar track just click in an empty space and load that track template.