Regarding 16/34 is that a guess or is that based on any actual information? Not trying to be hostile here, but as a very frequent passenger in DUB I can't think of ANY occasion in the past when I've not taken off or landed on 10/28.
Runway 10/28 is the preferential runway in Dublin but when wind conditions so dictate, either 16 (which has an ILS) or 34 (which is a non-precision VOR/DME approach) will be used. The only exceptions tend to be transatlantic departures, most of which would require the longer runway for performance reasons. Runway 16/34 has also been in use at night recently (typically from 2300 to 0500 local) to faciliate maintenance work on 10/28, so despite what you have experienced, it is most definitely used from time to time. See relevant notam here:
http://www.iaa.ie/safe_reg/iaip/Publ...2007_39_en.pdf