Ah but,
This is the statement of the girl left in England who very likely had no concept of what New Holland was really like.

Here are the appropriate stanzas from an early version. (c1776)

New Holland is a barren place,
In it there grows no GRAIN,
Nor yet no habitation,
Within for to remain.
The sugar canes are plenty,
the wine drops from the tree,
And the lowlands of Holland
Hath twin'd my love and me.

New Holland is a bonny place,
But it is scant of men,
Yet to conquer New-England,
Is what they do intend:
For there is none can win them,
So well they know the sea,
And the lowlands of Holland,
Hath etc.

I hardly think she can be talking about Holland and New Holland in the same breath so we probably assume she is referring to merchant ships going to Australia and America. The older song seems to have nothing to do with being pressed or whaling.