I’m feeling a bit torn myself. I understand the thinking behind the vanilla rules; it helps balance out some of the spellcasters’ power, especially at higher levels. But my understanding of balance in 5e is that it’s to balance the players against each other, to avoid having 1 or 2 players be so clearly better at so much that it naturally pulls the limelight away from the rest of the party and causes people to lose interest their own character.
I think totally unrestricted spellcasting carries the potential for imbalance, but doesn’t guarantee that outcome, and if I’m not making my spellcasters manage their resources then I’m doing something wrong. Something like Matt Mercer’s house rule “spells of 2nd level or lower” would also be a good compromise because it allows the utility of things like Misty Step, or for a Gish to summon a shadow blade etc.
What do y’all do at your tables, and why?
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Honestly, as far as I've seen most spells aren't an issue. Only sorcerer quickened spell really makes it an issue, but that's mainly an issue with quickened spell rather than anything else.
I also believe Jeremy Crawford or someone has mentioned that balance wasn't the concern when the role was put in place. I'm not able to look for the source right now, but I think Treantmonk had it in a video about this rule.
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Haste already says you can't use the action it grants to cast a spell. If quickened spell had a similar thing ("If you quicken a spell you can't casts another leveled spell on the same turn." or something) it definitely wouldn't be an issue.