This is probably an unpopular opinion, but I find modern C++ with templates and constexpr to be quite fun, mainly from the perspective of trying to do as much at compile-time as possible. Most of the resulting code is nearly incomprehensible and never gets used for anything outside of a godbolt demo, but trying to do complex tasks within the limited and unintuitive world of compile-time evaluation is something I've never really been able to find in any other language.
i don't want to hear about rust, const generics are almost useless and you know it, specialization isn't really a thing and nothing like variadic templates exists yet