I love combining apples, cinnamon, AND vanilla in a pie, each enhances and deepens the other wonderfully; the vanilla does get rid of the slight bitterness that cinnamon tends to have, and gives a wonderful aroma and taste. I use freshly scraped vanilla bean seeds, and purchase the vanilla beans online at http://www.Beanilla.com for best results; the beans tends to be fresher (moist, slightly sticky, and vacuum-sealed in their packaging), and the prices are reasonable. I do not get the same taste at all with just vanilla extract. If using an extra buttery crust that is a bit salty, small flecks of thyme sprinkled over the top of the apple pie would be delicious!