Oh, sometimes the others wander up on deck for various reasons, but it is just me for the most part.
[How did she explain that she is both lonely because she is only one of two ponies here and dearly misses her sister, but also that she enjoys being alone because she is no longer subject to the moment-by-moment scrutiny of Princesshood, and furthermore that she's quite used to being lonely so she barely notices it? Heck, Celestia barely can wrap her hooves around all that herself and she's the one feeling it.]
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[How did she explain that she is both lonely because she is only one of two ponies here and dearly misses her sister, but also that she enjoys being alone because she is no longer subject to the moment-by-moment scrutiny of Princesshood, and furthermore that she's quite used to being lonely so she barely notices it? Heck, Celestia barely can wrap her hooves around all that herself and she's the one feeling it.]