Does the Airbus A380 take off differently than other aircraft?

At least from SFO it seems to go straight ahead without flying any curves for a long time. And it seems to go very slowly, is this only an illusion?

Takeoff speed is actually the same more or less for most commercial aircraft. A380 takeof speed is roughly 150 knots while for an A320 it is also roughly 150 knots (I say roughly because the precise takeoff speed depends on how much cargo and people is being carried).

You see an A320 as being much faster than an A380 at takeoff not because the speed required for flight is taking off is any different, but because it is an optical illusion caused by the airraft being in the air and by the A380 being much longer than an A320.

Your eyes perceive velocity only in respect to other objects in the same plane of movement as the aircraft; because aircraft operate literally out of thin air, there are no in-plane reference objects for your eyes to correctly estimate the speed.

In that case above, the only reference you have left is the aircraft itself, and how fast it moves relative to its own length is how you will perceive the aircraft’s speed. Well, because an A380 is twice as long as an A320, if they are both flying at the same speed, the A320 moves faster relative to its length than an A380, so your eyes think the A320 is moving faster when in fact this is not happening at all.

I will add to the other question, why it seems to fly straight for so long. All Europe-bound (and, for that matter, Asia-bound too) flights depart SFO using runways R28L or 28R - winds permitting, as they usually do - so named because they are along a heading of approximately 280° (strictly speaking, 282°), i.e., due West, because these flights utilize the larger aircraft that require the longer runways. Because of noise abatement procedures over downtown SF, aircraft typically continue just over the Pacific before turning right to a heading of roughly 10-25°, right over the Golden Gate, then Tiburon, and onward to Europe.