If ptyx consistently has problems with his dive computer locking up, then I suggest he needs further training.... or attempting to complete dives that are outside of the parameters of his computer (i.e. technical dives).
I do not, I never locked mine (although I've seen people locking theirs), and happily dive with my Vyper (which is even more conservative than the average). However, most of my diving is shallow (most operators limit themselves to PADI stuff), with a single tank - so I'm air limited more than deco limited.
I fully appreciate the capability my computer has to adapt to whatever profile I do (usually triangular), especially since I seldom know in advance exactly what I'll do. It is also very helpful computing lots of dives over a week - something which would be really painful with table or software. It does keep track of seesaw profiles/slow ascents better than I would be able to as well (yes, I'm evil and do those sometimes).
That said, I'm trained for deco/nitrox (and trimix will follow I find find something I want to dive requiring it), know my computer limitations and realize that if I were doing deep square dives (typical wreck), my Vyper would give me deco times which - even compared to tables - are ridiculous.
I'm not against or for computers - they're a tool - and a damn convenient one. But as all tools, they have limitations - and blindly ignoring them ("computers rock, those DIR guys are retarded!") or considering them an abomination ("real divers plan everything, computer users are unsafe slaves to their machines!") won't help the OP much...