I do dislike the Dead Spots in my schedule during cons. =_=;
I have exactly as much con experience as you but whenever we hit a Dead Spot my group and I usually grab a bite to eat at eateries overly crowded with fellow cosplayers, if not to eat than to just catch the looks on the faces of normal families eating there too! XD
That, or we check out the cosplay gatherings going on at the time. Those are always entertaining as a group of cosplayers put in one place always guarantees that shenanigans will ensue.
Cosplays in Progress:~Dean Winchester (Supernatural)
~Bloody!Kevin (Welcome to Night Vale)
~LoveMeUniform!Kyoko Mogami (Skip Beat)