I said in the first thread that an older relative counselled me that grief is like a burden that's always there, but gets lighter over time.
I think she's right, except that it unexpectedly becomes weighty at certain points - the sort of thing that you're talking about, I think @Hisredipad - you come across something that you know he'd want to talk about, or you get a bit of news that you want to share with him.
I took a bit of a slump over the past few months because I had an unexpected legal matter to deal with compounded by the fact that I had to read documents in a language that I don't know very well. (If you want someone to order domestic coffee or brandy, I'm your woman...)
At various points, I've been shaking my fist at Dad for refusing to teach me the language.
I think I'm at the conclusion now, but it's knocked me for six. A hug from DH would have made things much better.