No I have not served, yet. But my dad served from 71-74 as a RA not US and favors a draft. You say "Professional Army" to him and he will give you a history lesson on what professional armies have done. Oh and both my grandfathers served in WWII, one was a volunteer and I don't know about the other.
At least one of the wars you say was won with a draft (WWII) was won with people mostly willing drafted.. a far cry from Vietnam. Even in WWI, it was treated as an adventure and many enlistees were eager to go.
Except for basic training, my father spent the entirety of WWII in combat. Except for a short trip home to get married, he didn't return home until 1948 from Germany where my sister was born. Later after I was born, he was sent to Korea. I was in 68-76 and my impression is different than your father's. From what I say in my 6 odd years while they had the draft, the attitude of the draftees was piss poor, period. During Vietnam, most of the draftees didn't want to be there, they were just looking for their time to be up. Vietnam was probably the first war where soldiers were not fielded until the duration.
This army of today (all services) is vastly superior to the Vietnam era, period, even if they are still only deployed in combat areas for a year or less..