Know how you feel! As I've mentioned before, mine still has a disconcertingly large number of original parts at 225,000 miles e.g. turbo, exhaust, alternator, air flow sensor, auto box......the list goes on. And the head gasket is leaking externally, along with burning 400ml of water per month (not necessarily the head, but it's going somewhere not immediately obvious!). Just paid €720 for new subframe bushes. There's a danger that I could incrementally spend loadsamoney on a "worthless" car.
A disaster would be just that - we only have one car since we retired.
But she's running well, has all the gear, and is fast and comfortable. There will come a point to say enough's enough, but luckily we're not there yet.
Oh, and there's the small point that we can't really afford to replace her