Larry Jones
Presets. The QuadCurve EQ presets are a good start, as are the project templates and lenses, but more of them, tailored to more genres and types of projects (2-hour narrations, 3-minute guitar pop songs, orchestral pieces, recording, sweetening, mixing, etc). Once the project is open, a whole bunch of track templates for various instruments and vocals would be handy. Basically, any pre-built setups that take advantage of industry standards and best practices, to get the ball rolling. Obviously users would adjust templates and presets to their own taste, and nobody would have to use any of the pre-built stuff, but I think it would make DAWs easier to use if they contained a lot of quick-start stuff.
PS: I know you can make your own templates, but the question is "what would make DAWs easier to use?" Creating a template from scratch is just as hard as working without templates, and almost impossible if you're new at the game.
Presets for sure.
Before synths had on-board preset memory, a person would have to know the details of how the synth worked in order to twist the right knobs and flip the right switches (or plug cables from here <--> there). Nowadays, a synth can have an ultra-sophisticated sound generator, but anyone can plug it in, find the power switch, and play many different sounds from presets. When someone later wants to find out how something is done in the synth, they can crack open the manual and examine, then twiddle the settings. If too many twiddles messes up the sound, just hit a preset to get back on track.
Computer-based DAWs have an inherent startup complexity involving coordinating various hardware hookups and software installations. There are so many choices for the components of a DAW, it seems hopeless to be able to simplify things in a central way. But maybe the portion of getting the DAW software started and configured could be encapsulated in presets. Sonar has templates for starters, so maybe promote the idea of templates to an easier level, like presets. Presets may not address the overall OP question, just beginner steps. Also, presets shouldn't take over the GUI for everybody.
Another potentially helpful paradigm in a DAW GUI would be something like "make this be like that". It's a generalization of "clone" and "copy", but applies to elements or sub elements in configuration. So when you have a project that has a track or bus or sound-chain that works in some desirable way, click on that and apply it somewhere in your current project. Again, similar to the idea of a template, but instead of creating, naming, and saving a template, then loading it in order to use it, just point and select an element, then apply it in a new place, or overlay an existing element. Determining what constitutes such elements is a high-level design effort, and would have to be built in to the foundations of the DAW software.
Ultimately, there would be the "me2fx®" region effect: say your words, hum your melody, then click on some existing song you like. Then all the elements of vocal quality, harmony, rhythm, instrumentation, sound stage, and even today's most modern and creative effects would be pasted from that song into your project, overlaid by your words and melody. (

I apologize)