I wanted to share some thoughts here, this time based on real life.
I am coming out (I already did actually) of a solar year with Pluto conjunct the Ascendant and Saturn conjunct the MC and my natal (and solar) Sun. Thus, Pluto and Saturn were the two planets on solar return angles and more so, they were in mutual reception and with exchanged natal positions. When I was reading my solar return last year this time, I knew it was going to be a big year (Saturn rules my natal Asc thus beginnings and was conjunct the solar MS and the solar return Sun was there too) with huge changes (Pluto natally rules the MC and was conjunct the solar return Asc). Each time I see a solar return Sun in the 10th, especially close to the MC, I think of years which we remember and when we look back we say "ah, this year!" Also, when the natal angles are repeated in the solar return as was this time (as signs not as degrees).
What I can say now is that indeed it was an important year and Saturn on the MC made the whole climate very heavy with responsibility. A year of big decisions. I was many times feeling like couldn't go any further but I kept persisting which I think is key to Saturn's gifts. Much discipline and persistence were required, nothing really happened overnight but somehow everything was working out at the end. Since I see the MC as the peak of a mountain, Saturn made the whole clombing a long and difficult exercise but the view from every top was magnificent.
Pluto on the Asc made the changes of life importance. As usual with Pluto, it all included closing many doors, some permanently. I can't really say it has been painful for me due to some details in my natal chart which make changes quite desireable and due to the fact that I'm used to Pluto's energy having him ruling my Sun, but I did feel like I was becoming another person (I don't neglect here Saturn on the Sun as he contributed greatly to the "being alone in the world and taking all the responsibility"), on a very deep emotional level, very personal. I faced some quite scary perceptions, thoughts, beliefs. I also had some experiences of more mystic nature. I now know things happen and exist. I believed before, now I know. On a very practical level, I changed my life from A to Z - people, places, attitude. Typical Pluto change - uprooting and cutting, pruning, burning and burrying. Then replanting.
I hope this helps.