Colorado Springs is about the same altitude (~6000ft), Denver is only a little lower. By and large you don't notice unless you do something that makes you breathe hard, in which case it'll take you a while to catch your breath for the first few weeks.

Honestly the biggest annoyance about living at altitude is baking recipes require adjustment pretty much all the time, you can't just use a bread recipe designed for sea level and expect it to work right.