Since you said that PP is tight for you, I would save the gate potions for those instances that you really, really need to get back to your bind point alive.
Actually, the corpse summoner made travel easier for non-casting classes. For example, yesterday I was in the Hole with a group as my rogue. We fought our way to the bottom of the Hole to the Guardian of the Seals location. Couple people went LD, a couple others logged for dinner. Before the corpse summoner, I would have been stuck and would have to try to run back to the OZ and find a necro to summon my corpse, and find a cleric to rez me or eat the exp. Now, I just ran to the first mob I found, let it kill me, summoned my corpse, and got a rez (since there always seems to be a cleric in the guild hall). Travel made easy.