It's worth noting that other classes have resources which require a short or long rest to recharge. For example fighters have Second Wind and Action Surge -- and superiority dice if you take that path.
Also, not necessarily obvious but important: warlocks get fewer spell slots, but they replenish on a short rest rather than a long one. I really hope Larian increases the limit on short rests (and makes long rests more of a big deal), because this'll all become more apparent and important -- as it should be.
