Zoom is back, and it uses the minus and plus/equal keys on your keyboard (next to the number row on a US keyboard) instead of the mouse wheel. The zero key resets your zoom, as does going into AFK (four key).
I've lifted (at least temporarily) the restrictions on zoom level, so you should not need the /zoom command anymore. However, I do restrict it a little differently for each location to make sure they look as the designers intended.