All that said, there is a sense in which Pentecost does have
a special significance for NT believers.
I think it safe to say that as New Testament believers we
experience life in the Spirit in a greater fullness. Old Testament figures
would have the Spirit come upon them for great deeds and yet the True Presence
was found with the Shekinah in the Holy of Holies. This again is another
mind-bending revelatory truth in that believers possessed the Spirit, but not
in its fullness, they were regenerated by the Spirit but the Spirit-Presence in
space-time (for want of a better concept) was spatially located in the Temple.
The typology and chronology bend, warp and are interwoven with the eternal-eschatological
realities that believers participate in. A simple appeal to omnipresence does
not alleviate the difficulty.