I haven't seen any non-fused adaptors on sale here in Ireland, but the issue is more with people bringing their own. The adaptors radio shack were selling for example didn't comply with any standards from what I could see, they were unfused BS1363 plugs.
Luckily, in most Irish installations you'd only be connected to a 16 or 20A circuit, so it wouldn't be that different to a continental European socket and it's highly unlikely that you wouldn't be connected via an RCD in any hotel or tourist accommodation, or if you're visiting a university campus or office.
So, in general it's not too risky not to have the earth. However, you'd be at significant risk in older buildings and in the UK where RCDs were optional until recently.
