Yep, NFL uses TM pretty much. For part of my job I take college students to NFL, MLB, MLS, and NHL games, and pretty much all of them only use electronic tickets. I keep the "ticket" open in the team or Ticketmaster app, and I can bring it up quickly if I need to show it, but I really haven't had to once we've gotten in the venues. But it actually works pretty slick.
The only bad part is since I work at a university in Minnesota, I have to have the fucking Vikings app on my phone. That is hard to explain to friends and family in Wisconsin.
On a plus side, I did just purchase 80 tickets for the Pack at the Vikes game in November for our students. Sadly, I have to go along as the group leader. Sometimes my job is rough.