Psion
Adventurer
And that's what rope trick is for.
Paladin: Quick! I know we are tired, but if the high priest finishes this ritual, the city's doom is sealed!
Wizard: But I've used my 5th level spell, rope trick!
Paladin: But...

To be fair, yes, rope trick is another one of those spells that may be too good at what it does for its level. But I would think that if I hadn't banned or (more likely) house ruled* it, I could think of a reasonable course of action for an enemy group who caught on to what the party was doing. And such a useful low level spell is sure to be known.
* - Indeed, I think that most of the abuses of rope trick rely on rather favorable interpretations. The ways I'd limit it would be more in the realm of rulings (with its level in mind) than house rules. For example, some people assume that you can't cross the boundary if the rope is gone... nothing about the spell text says that.
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