It's not a huge problem now but imagine (maybe somewhat in the future) you paid for something in a shop of a significant value (say $100) in bitcoin and the vendor required one confirmation for payment to be accepted. Waiting 10 minutes wouldn't be a problem  but 1 hour or more would start to be really inconvenient. You could also find that so many transactions had built up during that hour that your transaction would be delayed by a block or two (even with a miners fee).

If bitcoin wants to replace existing payment structures then we want to think of ways we can avoid these delays even if they are occasional.

3 days ago there were 2 long waits within a 2 hour period

364834   11/07/2015 09:14
364835   11/07/2015 10:03
364836   11/07/2015 10:06
364837   11/07/2015 10:09
364838   11/07/2015 10:16
364839   11/07/2015 11:08