I lived in East Mesa, right behind Red Mountain Park. Population easily went up threefold when the birds showed up. Driving become a major nightmare...
Same here in Sun City West...about 10,000 in summer to 35,000 in winter.They are rebuilding the intersection at Bell and Highway 60 so we have a bunch more traffic going through here right now..Spent 3 weeks in Mesa in October when I was RVing...can't say I was very fond of that side of the Valley.