It does appear to be Lonicera. The shrub types are invasive like the Japanese honeysuckle vine.

If it IS a honeysuckle - and I'm not convinced it is - it is not one of the common shrubby invasive species, like L. morrowii, L. tatarica or L. maackii. Neither the flowers nor the foliage look very similar to these. If anything, it looks more like L. standishii or xpurpusii but a bit late in the season for either of those.

FWIW, not all shrub honeysuckles are invasive - Lonicera nitida, pileata and crassifolia are all great garden plants. Although not very likely to be found in Maine :-)