I don't usually listen to classical music, and my live-music habits are the same, so when I attend concerts they are usually rock, or sometimes country/roots or blues, or singer-songwriter, that general area - so mostly fully amplified performance, and occasionally true acoustic.
As I've gotten older, I have gotten more discerning and I also have become more aware of how much damage the concerts of my youth probably did to my hearing, so I attend a lot fewer shows than I used to, and I always wear ear protection (which, sadly, reduces the enjoyment somewhat, but it's simply not worth it to me to damage my hearing further).
At this point I have sworn off any indoor amplified concert - they are too loud for me and they almost invariably sound atrocious: terrible acoustics, overloaded sound, just dreadful.
I do, however, still really enjoy amplified shows at outdoor or partially outdoor ampitheaters - if anyone here is on the East Coast of the U.S. you might be familiar with Merriweather Post Pavilion in the MD suburbs of Washington DC, or the Mann Center in Philadelphia, or the Susqueahanna Center in Camden NJ. With those venues you have a choice of covered seating or fully outdoor lawn seats, and either way there's no overpressurization of the space because of the open sides - which also create minimal reflections relative to a closed venue.
It's still 50-50 whether it will sound good or not, but at least there's a decent chance that it will be worth it for the impact of seeing and experiencing a live show in-person - I find there's an emotional and physical "goosebump" experience that can't be replicated any other way, just from being aware that one is in the presence of the actual performers in real time and space. This, BTW, is also why I am so unrelentingly critical in other threads here of the "live performance/true realism" standard for hi-fi sound reproduction: for me the quality of the sound itself is not what produces spooky realism. Rather, it's the awareness that I'm actually in the same space with the performers (and with other people), and no degree of playback quality can convince my body and emotions of that when I'm sitting in my listening room.
Finally, while a great outdoor/semi-outdoor concert is a memorable event for me that I think of fondly for years afterwards, for sheer emotional connection in the moment I agree with
@SIY - nothing beats being in a more intimate, close-up situation with a small group, or just duo or solo, acoustic performers, being able to make eye contact while they're playing or between songs, not having them far away or up above you on a stage, etc, and hearing the direct sound from their voices and instruments unmediated by amplification and transducers. It's quite moving.