alt Hacker NewsSnap is a little intimidating compared to Scratch.
It's clearly designed for older students, but at that point some of the advantages of blocks are lost.
Most of these systems suffer from the 'canvas' model, where you have many stacks of blocks scattered around the canvas as they are created, possibly in no particular or logical order. It's difficult to find things or to get a good overview, and really becomes a navigation problem as projects get bigger. I think they would greatly benefit from a more traditional ide/file type structure, or some other way to structure 'stacks'.
In Snap! version 12 they have added the ability to create tutorials, which are projects that load up with a limited set of blocks (you choose what set is available when creating the tutorial). This fixes the intimidation problem: you can even create a set of tutorials that, if the student goes through them in the recommended order, teaches the basics with just four or five blocks available at first, then slowly introduces concepts over time.