"How few would believe that from sources purely imaginary such happiness could be derived! ...What a treasure is thought!  What a privilege is reverie!  I am thankful I have the power of solacing myself with the dream of creations ... May I never lose that power, may I never feel it grow weaker."  - from the diaries of Charlotte BronteOne casualty of a busy lifestyle might be that we don't leave time to simply be thoughtful!  Even as someone who loves time to think and wind down, I find it’s easy to overschedule and not leave windows where I can enjoy peace and solitude. 
In fact, sometimes silence makes people uncomfortable.  When I’m running with friends the chatter is fine (and often a nice distraction) but I don’t mind long stretches of quiet on the trail either.  Although it makes some runners nervous if every space isn’t filled with noise. 
Like Charlotte Bronte, I treasure thought.  I’m more recharged by quiet, which probably speaks to my introversion.  The good part of enjoying solitude is that even if I’m home alone, I never feel lonely!  
“The happiest of all lives is a busy solitude.”  -Voltaire