I usually forget the details of puzzles soon after solving them, but the one that stuck in my mind for a long time was Difficulty by Chalicea. To get fluent clues and a preamble, as well as a grid, that missed the letter O was an extraordinary achievement. Yes it was on the easy side, but as the Notes for Setters state: The essence of a Listener crossword is elegance and subtlety of theme and clueing, not difficulty per se. POTY for me.
Runners-up, based on the gushiness of my posts, would be
It's Dark up here by Colleague
Shady Characters by Malva
X XX XXX by Somniloquist
It's tempting to add Army and Navy by Shackleton, but the "six each" business spoiled for me what was in every other respect a brilliant puzzle.
HNY to all.