Quickened healing spells for healing in combat beyond healing / mass healing word, or quickened buffs while still popping off a cantrip. Going divine soul opens up the options for spells to select quite a bit and quicken is nice for a lot of spells. And like you said, the list of touch spells improves a lot.What other good synergies are there?
A quickened heal and still twinning a firebolt can make the cleric and wizard both jealous. ;-)
It's still hard to select the spells. Compare that to dipping a level of cleric for all the 1st level cleric abilities that come with the MC.