I don't find any problem in using bitcoin at a moment, as I am only using it online and I am very much satisfied with it and if I have to buy something in real world then I don't hesitate in converting it to fiat.
Yes you are lucky not to have problems in bitcoin. I myself have experienced delivery delays in bitcoin so delayed until many days. It was very disturbing me because I badly needed funds in quick time. Maybe it's a matter of bitcoin have ever experienced.
If a transaction doesn't get confirmed for a fixed amount of time (2 days, if I remember correctly), it gets thrown away from the transaction pool (an in-memory list of transactions that are not yet confirmed), and you are essentially back to square one as if you didn't create this transaction at all. On the flip side, Bitcoin miners may potentially collude to only accept transactions with fees above some arbitrarily set limit. This is what seemed to have actually happened in July, 2015, when there were literally thousands of transactions stuck in queue (transaction pool)...
Some people euphemistically called that "testing Bitcoin limits"