If you think of goals as setting SMART goals in order to psych yourself up or set pace for an undertaking, then less is less. Meaning, less is better. You can see this in the literature as well. For example the aforementioned Leo B. did set one goal or three MITs, before he went goal-less. Even Covey warns against setting up too many roles…
In GTD we see a spin into the opposite direction: your projects and AoF lists become better, if you add more to them for the sake of completion or finer granularity. You don't want overcommitment, but you want the amount of detail that helps you best! I remember one poster who went absolute extreme with only eleven GTD projects, gasp! That's still three more than Covey's recommendation of eight roles.
If you combine either time-blocking (like Covey) or SMART goals with GTD projects, you probably end up using those techniques only for a few select projects, because of the functioning inherent to them.
At least, I didn't find a farmer in this thread whose example would contradict this theory…