it does feel good to nurse your baby. you are close to your baby, and it is very relaxing. i usually fell asleep while i nursed, i got so relaxed, especially at night time. other than that it just feels like... a baby nursing. but it is really usually more of an enviroment that parents give their babies while they nurse (quiet, calm, sometimes dark if at night or evening. sometimes you are rocking back and forth with them or laying down with them. whatever) and being close to your infant that makes people feel good. also, there are some thoughts on chemicals in the brain that are "feel good" chemicals, so that might be part of it as well.
I agree with you. Just reading your description made me "feel" all warm and fuzzy

Any woman that had a man just latch on and suck would probably slap him off her in a couple minutes.... if it took that long....any good sex manual will tell a man concerning the female breast that if you want to excite an erogenous zone, you need to vary the speed, the pace, the tension and so on....
having a baby's steady sucking away along with milk trickling out of their little mouth when they grin at you is a totally different kind of pleasure.