Stirges have cemented themselves as my favorite D&D monsters at this point...

Not my favorite but very high up there.

One of the things I like about stirges is their ability to stay relevant over a large range of levels. You can throw a stirge at a party at 1st level, but they truly scale up with numbers.

They're even nastier under my house rules than normal because I have a 'clinch' maneuver and stirges have improved clinch which makes them really hard to hit once one of them is on you (they're using your own body as cover). Once you hit the point that a swarm of stirges is no longer so much of a problem you can keep them relevant through concealment and terrain, and at even higher levels by giving them templates - I'm personally fond of air elemental and fire elemental templated stirges.

We seem to have similar taste in traps as well. I like traps that provoke a lot of party teamwork and cause damage over extended periods, because I want a trap to be an encounter and not just ticking hit points off of your character sheet.

Other monsters I adore:
Mephits
Gibbering Mouthers
Wererats (Now that I think about it, I have not had enough wererats in this campaign.)
Manticores

ncG1vNJzZmivp6x7prrWqKmlnF6kv6h706GpnpmUqHy0wMirnp6rXZ2ut7GMnJymnZ6psqV506GcpquVocOmv4yaqmalqWKzosLOq6CtnV2ZeqV5zKilrKyVp8BurdNmq6Gho2K9sLXNrWVvbWdthnF7