I don't mind it, I actually kinda like the challenge to work in every effect I want without exceeding the CPU limit. Work with what you have. It forces me to optimize my presets, consciously think about what I need it to do and cut the fat so to speak. Well, within the current 80% limit that is, so I guess my presets can be on the flabby side.
I don't
need a Chorus running at 5% mix level, but give me the option and I will. I don't need Reverb echo density at 8, but if I can, why not? Usually certain blocks or settings are in my presets out of convenience/laziness too, because I'm copy-pasting most of my own presets to use for different songs, sometimes only adjusting the BPM value. Then when adding things on or exchanging blocks, things can get out of hand so the challenge reappears.
I'm coming from the AxeFX 2, and was running my presets at the limit on that unit too, with 2 amp blocks and 2 reverbs for example, simply because it would let me and that seemed the best way of designing my presets. Now I'm getting the same (well, actually better) sounds and effects from the FM3 having optimized those to fit within the current CPU limit (thanks Channels feature and Plex Delay!). There are enough possibilities to optimize CPU usage whenever I run into that limit without really sacrificing sound quality. Without seeing the value on screen, I don't think I can hear a difference in reverb echo density of 6 vs 8, or a 5% Chorus mix, while that difference may keep the CPU in check and also allow me to run a preset with wah, tremolo, drive, phaser, delay and plex delay added in.
If you're aiming for the ultimate sound quality of studio reverbs and ultrares cabs with a kitchen sink of effects, then there's the AxeFX 3. Which is tempting sometimes, but I enjoy the compactness of the FM3+FC6 combination a lot as well.