I guess I've had a similar experience. I had a Cateye Double Wireless on my primary road bike for about two years and after having some difficulties with the sending unit, the thing just gave up the ghost about a week before a long two-day charity ride. I wound up taking the sensor off the bike and left the computer at home. I thought about moving a wired computer from another bike, but ended up not doing it.

That was two months ago. The mount is still on the handlebars, but I haven't replaced the computer.

I admit its more relaxing to "just ride" and not fixate on what my cadence is, how far I've gone, how fast I'm going at any given moment. I'm still completing my "normal" rides in the same elapsed time (actually, marginally getting faster) so I don't think I've lost anything.

Its getting close to end end of season for my longer rides, so I'm not going to do anything about it now, but I'm sure that over the winter I'll replace it if I can find the right computer. I've been toying with the idea of a Garmin, but its a bit expensive - and I know the potential for focusing on the numbers instead of the ride experience will be overwhelming.