It's so true. I wish there was a way to convey that to some of the guys who come on here with a 10" Klipsch subwoofer and wanna drop $2k on an amp upgrade. You get so much more from good, clean subwoofage. It's not about rattling the walls (unless you want to!) so much as it is clean, effortless bass. For all my subs my system is really pretty nicely balanced.
I think even music that doesn't necessarily play much below 30 - 40 hz benefits because there are still some harmonics that drop below that. I'd say it translates as more of a sense of spaciousness, weight and effortlessness. Once you experience it, there ain't no going back!