In Lineker's case, a heat map obviously wouldn't have told you much that you couldn't tell just by watching him. But some of the modern statistics and visuals used to analyse football can give instant insights that would otherwise take a lot of very careful match-watching to come up with. If you were to ask me which of Rose and Davies has been the better option at left-back from a defensive perspective this season, or whether our players actually put less of a shift in after a midweek Europa match, I wouldn't be able to tell you. I could have a guess, but I'd rather base it on solid data than on gut feel and/or whichever bits of matches I've seen have stuck in my head.
I think half the reason that a lot of people dislike the proliferation of stats in football is that they take away a lot of the debates and arguments that we enjoy so much... who should start? Who played well? How did that sub impact the game? Where should we be aiming our corners? Stats take a lot of the fun out of talking about football, whether it's in the pub or on here. Doesn't mean they're not useful...