I strongly dislike the train at DEN along with the big TSA check point that can have nearly endless lines.

I also prefer to walk when there is sufficient time.

More facilities in women's rest rooms with dry places to put your carry on bag so you don't have to put it on a wet floor while you are 'busy'.

Obvious places to put in items that need to be recharged with enough for all who need them.

Clear signs in large print.