Ahh it's reassuring to find an iPhone SE owners' club here!!
I've had mine since 2016 and every year I look longingly at the new iPhones but I just love the small size of the SE. I love being able to, for example, hold a bag of shopping in one hand whilst I walk down the road checking bus times on my phone with my other hand – without worrying that I'm about to drop the thing any minute due to big-screen-finger-gymnastics. I also love that its size and weight make it almost imperceptible in my trouser pocket. I have dynamic text on the iPhone set pretty small too so when doing text-based activities I can still see a fair bit on the small screen. I do wish the camera were a bit better, but I take very few photos on my phone because until they match the quality of even my decade-old DSLR I'd rather take the bigger camera with me the few times a year it's needed.
It's interesting seeing too how many people team their SE up with an iPad mini; that's exactly what I do too. If I'm popping out just to do a few jobs and only need a device for the basics like texting I'll just take my phone, but if I know I need to actually get something done I'll bring the iPad which is perfectly sized to fit in a jacket or small bag pocket. In fact only earlier I was sitting on a bus for nearly 90 minutes catching up on web articles/posts via RSS using the iPad. I was pondering what it'd be like to do that on an 11 Max whose screen isn't that much shorter than the iPad mini's but is a lot narrower when held vertically. I quickly came to the conclusion it would be nowhere near as pleasant an experience: when holding them horizontally, reading on the Max would require a lot more scrolling (which makes my eyes go funny after a while!), and when holding them vertically for say a single-column article, it'd be much smaller and more nausea-inducing whilst on a bouncy bus.
At least SE owners got one bit of good news earlier this year that some of you might have missed: Apple released a new 4" iPod touch. Why is that good? Because it means that even when the SE no longer gets the latest iOS updates, developers will still need to keep their apps compatible with 4" screens for a little while longer because there'll be iPods in use.
Speaking of which, I have sometimes wondered if the upgrade solution for SE owners might ultimately be going back to a really old-fashioned system of having a small mobile phone plus an iPod. Alas, hardly anyone is making decent plain phones any more either. Sigh.