I know what your friend means when she says it would be nicer if the shrubs were layered ie higher ones at the back to medium ones down to smaller ones at the front. What is it with men that they want to have acres of bare ground between plants - I have a neighbour just like that. In my garden it is very difficult to see any bare ground at all.
I think now that the conifers have gone and esp if you dig in lots of compost and/or manure in the autumn, you will find that the ground will return to a more normal state - it has just been very dry because the conifers have sucked all the moisture out of it.
Smaller growing shrubs that will require minimal maintenance would be euonymus, hebes (bonus flowers), viburnum judii with equisite scent, philadelphus Belle Etoile, rosemary, lavender etc.