PTSB do not use 'Card Activation' as such, the "activation" of the card in this case is the first time it is used.
Unfortunately though, whether the card is activated or not, the GSD rules mean that if the card is not closed then you are liable.
If you don't think you'll be using the card between now and April 2010, I'd suggest closing it so you don't have to pay another €30 next year!
There was a 'Stamp Duty Out' campaign being run by the Consumer's Association of Ireland but I'm not sure if this is still active. It really is an extra hassle that neither the customer or the card issuer needs!