Yeah I had tried using List view for it as well, but there's something about having a proper calendar-style vertical timeline that is just so helpful in visualising where there are 'spaces' in the schedule. In List or Day view currently, you have to look through the times of all events and tasks to work out where there is a space.
As a workaround I am currently using 'Duplicate as Event' for every scheduled task, so that they appear in the calendar app alongside events. But it's not perfect because if you change the timings for an task, you have to remember to replicate this for the event too.
I looked at Fantastical too but it just doesn't offer the kind of flexibility of Goodtask. And yeah 
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Hopeful!