I've only carried out 3 go-arounds in the {decade+} I've been flying professionally. I'm not sure I see the manoeuvre as 'routine', though I'd imagine Heathrow Director has seen a fair few and it may, as a result, appear to be a normal part of an aeroplane driver's day at the office. Like most things in aviation, it's easy to screw up when complacency or fatigue creeps in. Sitting at the threshold watching someone else go around always invites comment on the flight deck; I'm not surprised to see discussion of GAs or RTOs on pprune.