Here's a minor suggestion that I didn't see. It's not a huge issue but it does add up. When adding projects you need to add start and end dates for each step of the workflows (at least in Smart Projects). You need to click a drop-down menu to add each start and end date. Each one takes a fraction of a second to load, and then it may take time to scroll/click to the date. By having to do this twice, the time adds up.
It could be helpful to make the start and end date-selectors be a single dropdown. Here are two examples... The first has two columns, one for the start one for the end. The second allows people to highlight a start and end in a single mouse stroke.
Customer support service by UserEcho