I envy you. I've never voted in a general election for any MP whose seat was marginally in danger. In the last 20 years I've lived in a mixture of medium and large inner-city, the Shires and wealthy London. Always lived in seats with massive majorites for Labour or Tory. Depressing, really.
Yeah, it's the same for a lot of people and it's unsurprising that there is so much apathy amongst swathes of the population when your vote is effectively meaningless. Sadly a switch to PR seems as distant as ever.