esselfortium
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Midtexture bridges in vanilla and Boom work by instant-rising and instant-lowering an invisible, self-referencing sector. This means both the front and back sidedefs have the same Sector Index set in Doom Builder. To make it instant-raise and instant-lower, you need to make three dummy sectors off-map. One that's merged with the self-referencing sector, and two more that touch that one. One of them should have its floor height set to the "raised" bridge height, and the other should have its ceiling height set to the "lowered" bridge height. For simplicity's sake I usually just set their floor and ceilings together, so they're both 0-height sectors.
To instant-raise the bridge, use special 83: WR Floor Lower to Highest Floor. The highest floor is above the floor's current height, so it will instantly jump to that height.
To instant-lower the bridge, use special 91: WR Raise to Lowest Ceiling. The same instant-jump behavior applies, for the same reason.
Make sure you set your bridge's outer edges to block monsters to keep them or their corpses from popping up or down when the bridge moves, and make sure the lines of your self-referencing sector don't have any 32-unit-or-more gaps between them for players to fall through.
Also, if you're using ZenNode it can sometimes be picky about it and make your bridges visible.
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