Great question! I'd say my sensibilities have changed-it'd be pretty weird if they hadn't after all these years-but not necessarily in the way yours have. In some ways, I'd say I've grown pickier about adaptations since I've had more time (and maturity) to analyze books and form opinions about just what makes them great. I've also grown more cynical about Hollywood doing great adaptations of the Narnia books. When I was a kid, I saw plenty of things in the books that were exciting. Nowadays, I feel like Hollywood's expectations of what makes an exciting action scene are ridiculously high. Also, when I was younger, I looked at the Narnia books and saw plenty of messages that everyone in my culture agreed were true like "don't enslave people" or "don't force women to get married against their will." I naively figured faithful adaptations could resonate with everybody. Nowadays, I feel like people in my culture are so bitterly opposed in everything that a faithful adaptation of Narnia would have the opposite effect and offend everybody.  

But I think I've always been favor of keeping unconventional narrative structures and potential corniness or weirdness. (I wouldn't say never change scenes that modern viewers would consider corny, just don't do the cowardly thing and completely cut them. I actually think Greta Gerwig's Little Women is a good example of this.) 

My sensibilities have definitely changed since then. I have since (especially in the past 5 years) really re-connected with the books and grown to enjoy the levity and the shenanigans that occasionally border on absurdism.  I definitely went through a phase where a hypothetical adaptation would have to change or cut a lot of things in order to make it "less cheesy".  I don't know why I've become much more open minded about the funny moments, maybe because I've become "old enough to enjoy fairy tales" 😉

As I have mentioned here before I have become more forgiving of Walden’s errors in adaptation than when the movies first came out.  In fact I like them better now than a decade or two ago.  Maybe it is because what is planned for Netflix seems farther from the books (e.g. the possibility of a female Aslan) or maybe because the films have grown on me. I hope I have become more sensible in recent years.  I like the Walden films much more than I used to.  I find them at least enjoyable as works of art even though they may not be perfect adaptations. I have become more picky about new adaptations, but it is mostly in the hope that Greta Gerwig will make a reasonably faithful Narnia film that is worthy of her audience.