I was employed at a location a few blocks away from the "A" line.  It was a miserable experience having to cross the tracks everyday.  You would wait for the train to pass, the light would change, one or two cars would go through, light changes to red.  The horns seemed excessive and not very useful to me.  You could hear them in my office, many blocks away from the track and it was annoying.
Another miserable experience was going from the "W" line to the airport.  Who designed this route?  The partially covered half mile hike you have take to transfer to the "A" line is pure hell in bad weather or if you have luggage.   I guess the unexpected 20 minute stop that we had in the middle of stations before we got to DIA gave me time to catch my breath!
Think I'll try that adventure again RTD?  Don't think so.