Keeping a marriage fresh & vibrant takes a combination of fun, love, patience, understanding, appreciation, support, respect, and, yes, a little work. JFK said the time to work on the roof is when the sun is shining. Just so, the time to work on your marriage is during the good times.
An important part of a caffected relationship is making time for each other, not just the leftover pieces of your day. 'Quality time' is a cliche, but there's a particle of truth to it. Love requires positive energy management to not only sustain itself, but to grow and prosper.