I agree, but I'd argue that instant-runoff/RCV is the second-easiest to understand, by far, while also being much better than simple plurality voting. Which is why I strongly favor instant-runoff.
That method is "Asset Voting", which works exactly like a plurality vote, except that once the totals for each candidate are known, the candidates are eliminated one by one (from least to most votes) and get to assign their vote counts to any remaining candidate.
If you agree with me and the parent post that voter confidence (including avoiding electronic counting machines) is the most important factor when evaluating possible alternatives to plurality (assuming the alternatives are no worse than plurality) then hopefully you will agree that Asset Voting is preferable to IRV/RCV.