It seems to me that a lot of what we're talking about in this thread comes down to substituting (sus)2 and (sus)4 chords for straight major or minor triads. It's one of the fun things about playing guitar -- you play a chord, lift up a finger and play it again, and go "ooh! I like that!" If you're inclined to figure out the "proper" chord name you can, which can then help you recognize and use the same tool in a different context. If you just want to play it without knowing what it is, you can do that too. Kind of like when the musical analysts talked about Lennon/McCartney's use of Aeolian cadences and such in their music, while John and Paul said "huh?"