Oh? The Bible tells us that in the last days we will have dreams and visions. Do you doubt that we ARE in the last days? God speaks to us through scripture, visions, other Christians, dreams, any number of ways. Why put God in a box, my friend?
Peter specifically stated that Joel's prophecy had to do with the Day of Pentecost ("this is that"). PS your name sounds familiar. I used to be BSunday.