The picture shows the President queuing behind a member of the public to use the ATM.
As far as I know he's not required to do this, of course. He could have someone go for him etc.
In the UK it's very unlikely the Head of State would queue for an ATM and people who prefer the pageantry, pomp and ceremony of Royalty might feel this kind of behaviour demeans the office and is not worthy of a HoS. On the other hand, people holding more republican values might feel proud of their choice in electing a person who lives as they do.
I hadn't noticed the security thing. Ireland is neutral, guns are stringently controlled and no existing paramilitary group has a motive to assassinate the President. The security is probably there to mitigate the slightly increased risk of a 'lone nut' attack and not much else.