Yes, very much so. If I'm watching a film and not really getting into it or enjoying it, I still almost always persevere right to the end, which includes a compulsion to watch all the closing credits, which for some films can be well over five minutes. Part of the motivation for this is no doubt also financial - if I've bought a dvd, no matter how long ago, I'm loath to have wasted my money by not watching it. Right now, I've had a dvd of The Good, The Bad and The Ugly for several years, and I'm almost certain that I won't like it, but am intending to watch it anyway (the bloody thing is almost three hours long as well).
There used to be a quiz show on the BBC called Mastermind. The host's catchphrase, when a contestant's time ran out as he was in the middle of asking a question was, 'I've started, so I'll finish'. That just about sums up this matter!
On the other hand, not being able to start certain tasks and procrastination in general are also issues for me in some areas.
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On a mountain range
I'm Doctor Strange