The Surgeon General recommends 150 minutes of moderate intensity activity per week:
http://www.surgeongeneral.gov/priorities/prevention/strategy/active-living.html
Even at 40 minutes of HIIT (which is more than moderate activity), 500m swimming and 45 minutes of weight training you're probably getting the minimum recommended activity for a week in 5 days a week. That's 5 times the bare minimum, which is not "essentially" the bare minimum.
I'm not saying that's bad, or that disc golf is that great of a work out, depending on how you play it might not even qualify as moderate activity, but if you're going to justify talking down to everyone because you work out a lot by stating an easy to research benchmark is only a good idea if you've researched the benchmark yourself.
My experience is that cardio and endurance is probably the most important thing to work on for disc golf. Not getting fatigued at the end of two rounds can be a big deal.