This is a well-constructed, if a bit over-written, strip, that illustrates the difference between two characters' outlooks. As such it more clearly defines their personalities, although in Lucy's case it's still looking at her larval phase.
I mostly remember Patty and Violet for the times they double-teamed Charlie Brown in the classic age of the strip. If one interprets Charlie Brown as a stand-in for Charles Schulz himself, a view that may have some merit, that may indicate problems with female figures. I think it is possible to read too much into this, however; mostly it just serves to develop Charlie Brown's pessimistic personality a little more.