Well yes, the "grandstand" at LHR can justifiably be described as laughable. I visit the building behind it for meetings from time to time and it's rare to see anyone actually using it - I'm told that it's next to useless for photography.
Having said that, as you pointed out in an earlier post, there are spots at Heathrow, and indeed many other UK airports, where the perimeter fence is closer to the runways/taxiways than that Schiphol location, and I've never seen it suggested that they pose a security risk.