In Super Mario Bros. 3, where Super Note Blocks are pink, the area afterwards usually auto-scrolls to the end, and it has lots of coins, as well as a 1-Up Mushroom occasionally.
In Super Mario 3D Land, where Super Note Blocks are twice as long, have white notes instead of black, and flash a rainbow of colors, the following area usually has a Super Star used to run through a group of enemies, or a platforming section that requires use of the 3DS's stereoscopic 3D, in order to receive a Star Medal at the end.
^"Keep an eye out for special Red Jump Blocks, which will warp Mario to Coin Heaven." - The Super Mario Advance 4: Super Mario Bros. 3 Player's Guide, page 10.
^Shogakukan. 2015. Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook, Super Mario Bros. 3 section, page 41.
^Shogakukan. 2015. Super Mario Bros. Hyakka: Nintendo Kōshiki Guidebook, Super Mario 3D Land section, page 185.