When I reflect on missing the theatre, I take it from two perspectives: (1) it has been an important part of my life for 55+ years, but this is not the first time that I have gone cold turkey or have had to greatly reduce my viewing, and I survived just fine and (2) for me, missing the theatre is magnified by the productions that I am missing.
Re prior cold turkey, My wife and I used to kid that the year before my first son was born (December 1990), we saw probably 30 Broadway productions (including repeats), 10 - 12 dance events, X concerts, at least 20 - 25 movies, and had a great time. In 1991, we saw Miss Saigon (first preview) and I saw The Silence of the Lambs. Period. After waiting so long and having a mega-hour job, i wanted to be home. I missed the theatre, but there were other rewards. I also started living outside of NY 25 years ago. That, coupled with small kids, meant that there were many dry periods. I can still list the plays and musicals that I managed to miss because they did not come to the places I lived or were not open when I did get to NYC. To this day, there are a number that I will always regret missing, e.g., Cherry Jones in The Heiress, Jane Fonda in 33 Variations, Brian Dennehy in Death of a Salesman, and many more. But, life went on.
Re productions that I am missing, I have to say that, FOR ME, if a pandemic had to happen, this was a pretty good time theatre wise. Why? The things I most wanted to see were revivals of shows I have seen many times, eg., I have seen Company at least 8 - 10 times, WSS the same (and I don't even love WSS), Virginia Woolf 5 or 6 times(and probably another 5 or 6 for the brilliantly filmed movie).
I thought the NT Live production of Lehman Trilogy was so well done that I did not feel that I NEEDED to see it live (and was not sure I wanted to sit in cramped Nederlander Theatre seats for a show that, although I really liked it, definitely felt long in Act 2 and especially in Act 3). Normally I would have been excited to see Six based on word of mouth, but I had not purchased tickets because I personally have a problem spending top dollar for a show that lasts 67 minutes (according to a friend who saw it, loved it, and clocked it).
After Tootsie, I had no interest in Mrs. Doubtfire (until at least the reviews came out and I had a chance to listen to the score); I had zero interest in Girl from the North Country (i have never been a big Dylan fan, and an awful lot of people on this board thought that it was unrelentingly dreary), American Buffalo (I have been bored silly by this short play twice before: once with Robert Duvall and once with Al Pacino, Plaza Suite (PS was dated 30 years ago), and a number of others. I had tickets to Tina, but was only going to see Adrienne Warren (who, based on reported attendance issues, I might have missed anyway). So, RIGHT this minute, I don't feel like I am missing many shows that were for me MUST SEES. I did have tickets for The Music Man for October, but even there the only reason I got tickets was because of Hugh Jackman, as TMM has never been one of my favorite shows. For me, it has moments of musical comedy greatness (with the right Howard Hill) and moments that make me cringe, e.g., I have never remotely been entertained by the early number on the train or Shipoppi (sic).
Couple this with the fact that I have seen some incredible entertainment that I had never seen before, mainly on streaming services, e.g., Broadchurch, Bodyguard, Luther, The Handmaid'sTale, Prime Suspect, Fargo, Godless, Mad Men, The Crown, The Plot Against America (talk about prescient!!!), and i am surviving okay.
I would be saying something entirely different if I had been excited about the Spring season...I just was not. So, for me timing plays a key role in managing down my normal disappointment.