Depends on the importance of the match and the time of the goal IMHO, if the goal had been in the last minute of two, i think the reaction to it would have been different, but to score so early in an away game means yes, we have scored but we still have plenty of time to screw it up in time honoured fashion, whereas if we score in the last 5 minutes then it is harder to fcuk things up, so we get more excited.
Also if we had lost last night, we would still have had a decent chance to go through, whereas if it is the last or second last of the group games then the result is more immediatley important (if you see what I mean)