Only in generations holding the boost button instantly starts the spin dash charge even while moving on the ground. In classic games + lost world you need to be at a stop, and crouching to charge the dash. But comes sonic mania and forces, you can now start the spin while mid air. Albeit with half the force. Imagine if the drop dash spins at full force!!!
I've yet to play this game (don't worry, I VERY MUCH plan on doing so) but this looks AMAZING. This is what a sonic level is all about: master the level layout and go HAM.