At its core, to dig something implies deep emotion
If you dig something, then you're saying, "I get a lot of enjoyment out of this thing. I wouldn't mind being around it for a long period of time."
If you say that "you dig" in response to someone's talking to you, then you're saying, "I follow you, and I value what you are saying."
If you "dig" a person walking by, on the other hand, then you probably mean to say that "that person is really hot; I am really attracted to them. In fact, I want to spend my life with that person or at least go sleep with 'em."
So if I said, "I dig e2 now," then I would mean that "I comprehend the inner nature of e2 and understand my position in relation to e2." There's a feeling of cosmic alignmnent.