Like you said, Cierra, the extra intensity means you hammer yourself quickly, but IMO the endorphin high from a quick, high intensity workout is way better than from a long protracted one. Once you're past the nausea anyway.
The only tip I'd add is to vary your rest days and training days based on what your body tells you. Sometimes I know my body is just not feeling it. Maybe I'm short on sleep without being aware of it, maybe it's a bit deficient in something, maybe it just wants a rest. When this feeling hits me, I chill. I allow myself a cheat meal if I've got a craving. I reward my body for looking after me. I might go for a walk and do some stretching, I might not even bother with that and just have a siesta.
On the other hand, sometimes I'm halfway through my session and ready to laugh maniacally because I feel utterly invincible and unstoppable. "Gym have puny weights! HULK LAUGH!!!"
At this point, it's time to start smashing myself. Supersets and dropsets on lifting days, extra time or intensity during HIIT/sprinterval sessions. Whatever the method, I make sure that when my body is bringing its A game, I challenge it to the utmost.
This has me happier at the gym now than I have been forever. It may be you don't enjoy the variance, but I find it exciting.