Yes! I hate the “at my earliest convenience” for the same reason – it comes across as “I’ll do it when I feel like it”. I would only use that phrase at work in terms of someone else (ie “at YOUR earliest convenience”).
Thanks for your email. I’m currently offline, returning on [date]. I’ll respond to your message then.

I think there must have been a discussion about this here in December, because when I recently came to set my OoO recently there was some previous wording along the lines of “I will be spending time with my family during the festive season and will not be checking my email until (date)”. I’m annoyed with myself for deleting it without saving it somewhere, because it was much better worded than that and I’d like to be able to use it again!
We’ve certainly come a long way since the honeymoon days of You’ve Got Mail, the 1998 Meg Ryan romcom in which each new electronic missive set Tom Hanks’ heart fluttering (and vice versa). These days, in tech circles, you’ll hear tales of folk who’ve set their email servers up to automatically delete unread emails after a week – before going on holiday for a full fortnight. Others have reduced the OOO to a single word in the subject line: “Nope.”