The Three Dialogues is not the only work by Berkeley with lush descriptions. Alciphron, the dialogue Berkeley wrote while in Rhode Island, trying to finalize the plans for his proposed College of Bermuda, is filled with them as well. Just one example, from the first of the seven dialogues:
After Dinner we took our Walk to Crito's, which lay through half a dozen pleasant Fields planted round with Plane-trees, that are very common in this part of the Country. We walked under the delicious Shade of these Trees for about an Hour before we came to Crito's, House, which stands in the middle of a small Park, beautify'd with two fine Groves of Oak and Walnut, and a winding Stream of sweet and clear Water. We met a Servant at the Door with a small Basket of Fruit which he was carrying into a Grove, where he said his Master was with the two Strangers. We found them all three sitting under a Shade. And after the usual Forms at first meeting, Euphranor and I sate down by them. Our Conversation began upon the Beauty of this rural Scene, the fine Season of the Year, and some late Improvements which had been made in the adjacent Country by new Methods of Agriculture.
Just as improvements can be made to the beauties of nature by proper cultivation and new methods of agriculture, so improvements can be made to the beauties of the mind by proper cultivation and new ways of thinking; and this point will be traced throughout Alciphron, which is on whether a particular new way of thinking really brings any improvements at all. And each of the descriptions Berkeley gives has either some symbolic import, or provides some in to the argument, by presenting ideas in picture form. (Perhaps the most impressive and fun of these is the description of the mount of easy ascent and the fox hunters at the beginning of the fifth dialogue.) They also repeatedly emphasize the theme of expansiveness and real, natural freedom, which is what Berkeley intends to contrast to the minuteness and affected freedom of the so-called freethinkers. To jump over the descriptions is risky: they underscore the themes that bind the work as a whole together, and without attending to them one might take the work to be much less unified as an argument than it is.
These things, in other words, matter, and the quality of one's philosophical reading skills is in some degree measured by nothing other than one's ability to see how they do.