You will:

• be able to join ~6 more maps on gliding
• be able to start an awesome minigame [/warp disaster]
• be able to spectate Action Mode (survival smp)
• get a cool stick that can play selected noise (e.g. entity.parrot.ambient) [do /noisifier]
• get a rank in Minecraft and a role in Discord
• get an npc in spawn with a custom message (must be appropriate)