Given a choice, I do vastly prefer bar-table height. Allows people to sit (with appropriate bar stools, etc.) or stand and more easily access the table. Also opens up the underside for more storage. So, given a choice if I were building a table, I'd go bar-height absolutely. However, having simply purchased folding tables, and using them occasionally for non-gaming stuff, I do not use bar height at the moment.
I suppose I could grab some cinder blocks though...