I'm not certain we're even discussing the same issue here.
In my riding, the second-place candidate received 15,305 votes out of 51,201, meaning that only 15,306 votes, or 29.9% of the popular vote was needed to win that riding. Which means that every vote for a non-winning party, AND all the votes for the winning party in excess of 15,306 were wasted. So it's not just my ONE vote, it's 70.1% of all the votes in my riding, or 35,985 votes that would be counted under some form of PR that are meaningless to the outcome of an election under our current system. And that's just my riding.
My current riding, Toronto Centre, faces a similar problem:
Total votes cast in 2004: 53,663
Votes for winning candidate: 30,336
Votes for second-place candidate: 12,747
Votes needed to win: 12,748
Votes for winning candidate wasted: 17,558
Votes for non-winning candidates (wasted by default): 23,327
Total wasted votes: 40,885
Percentage wasted votes: 76.2%
So in two ridings alone, I've already seen 76,870 votes that made no difference to the outcome of the election.
A third riding, Western Montreal's Jeanne-Le Ber (the closest non-territorial riding in the country in the last election, and thus the riding with the fewest wasted votes; the closest riding, Yukon-Western Arctic had only 13,478 votes cast, so it makes for a poor sample):
Total votes cast in 2004: 45,676
Votes for winning candidate: 18,766
Votes for second-place candidate: 18,694
Votes needed to win: 18,695
Votes for winning candidate wasted: 71
Votes for non-winning candidates (wasted by default): 26,910
Total wasted votes: 26,981
Percentage wasted votes: 59.0%
That's 103,851 votes wasted in three ridings.
If we extrapolate the problem, assuming (very conservatively) that about 60% of votes are wasted per riding on average, with 13,489,559 votes cast in the last federal election, that means that over 8 million votes did nothing to influence the makeup of Parliament.
I don't speak for just me. I speak for 8 million Canadians who cast their votes for no reason. It's simple math. The Single-member Plurality system disenfranchises us in a huge way.
Plurality systems work great when there are only two parties.
*Edit: When I say a vote is wasted, I mean beyond the additional party funding. But funding is not all that's needed to participate in elections, and it's certainly not the only thing that matters to activity in the House. Look at the Green Party: 582,247 votes cast for them, which means $1,018,932.25 in funding, but they still don't get to participate in the leaders' debate, and they still didn't get to sit even a single member in the House during the 38th Parliament.