I am skipping all filler episodes and arcs in my viewing but not the Cover Stories episodes or arcs.

Those filler episodes are episodes:
54-61
131-143
196-206
220-228
291-292
279
303
326-336
382-384
406-407
426-429
575-578
626-628
747-750
Special 4

Those filler arcs are:
~Sea of Survival: Super Rookies Saga (1st Half of One Piece)~
Warship Island Arc (East Blue Saga): Episodes 54-61.
Post-Alabasta Arc (Alabasta Saga): Episodes 131-135.
Goat Island Arc (Sky Island Saga): Episodes 136-138.
Ruluka Island Arc (Sky Island Saga): Episodes 139-143.
G-8 Arc (Sky Island Saga): Episodes 196-206.
Ocean's Dream Arc (Water 7 Saga): Episodes 220-224.
Foxy's Dream Arc (Water 7 Saga): Episodes 225-228.
Boss Luffy's Historical Special (Water 7 Saga): Episodes Special 4, Episodes 291-292, 303 and 406-407.
Lovely Land Arc (Thriller Bark Saga): Episodes 326-335.
Chopper Man Special (Thriller Bark Saga): Episodes 279 and 336.
Spa Island Arc (Thriller Bark Saga): Episodes 382-384.
Little East Blue Arc (Summit War Saga): Episodes 426-429.

~The Final Sea: The New World Saga~ (2nd Half of One Piece)~
Z's Ambition Arc (Dressrosa Saga): Episodes 575-578.
Caesar's Retrevial Arc (Dressrosa Saga): Episodes 626-628.
Silver Mine Arc (Yonko Saga): Episodes 747-750.

Kind of corny and kind of odd, this film doesn't really have much of a point other than to be entertaining. To be fair though, it is very entertaining.