I am pretty sure this was brought up already...but with all the new folks joining the game this is probably more critical than ever...for those that are avoiding crowds, and for those that are looking for them.
Could we get a map overlay that shows congestion areas? Since it would need to be dynamically generated, would love for it to be toggled vice on the map at all times. Sort of like the google map traffic overlays. That way you get red streets where there are more than 10 glitches, Yellow streets for 3-9, and Green streets for 2 or less. Or maybe the numbers can be higher...I just know for me, when there are more than 10 people in a location, I want to avoid it...unless it's a party or some special event (like a clare celebration) - of course that would make the events easier to find also.
(Thanks for adding the metro/subways...that was a big help to the maps (yea, I know it's been a while...but it's the gift that keeps on giving)).